## lightest alkaline earth metal

3. The alpha particles released by radioactive decay of radium atoms react with atoms of beryllium to give, among the products, neutrons with a wide range of energies—up to about 5 × 106 electron volts (eV). The periodic table is made up of 118 elements. Calcium and barium are weakly radioactive: calcium contains about 0.1874% cacium-41, and barium contains about 0.1062% barium-130. 3. (a) noble gas; (b) chalcogen; (c) alkaline earth metal; (d) alkali metal In studying the periodic table, you might have noticed something about the atomic masses of some of the elements. Let us know if you have suggestions to improve this article (requires login). 012 Magnesium Cylinder. Ba + I 2 → BaI 2. Answer. What alkaline-earth metal has the lightest atoms? 4. 3. The oxygen compound beryllium oxide (beryllia, BeO) is a high-temperature refractory material (melting point 2,530 °C [4,586 °F]) characterized by an unusual combination of high electrical resistance and dielectric strength with high thermal conductivity. ALKALI METALS Found in group 1 of the periodic table … Phenomenological models based on the difference of the electronegativities imply the ionic character of about 20-30 for the investigated molecules, except ones involving the lightest alkaline-earth-metal atoms [ ] . Because of their reactivity, the alkaline earth metals are not found free in nature. Like all alkali metals it has a single valence electron that it readily gives up to form a cation or compound. Basic beryllium carbonate, BeCO3∙xBe(OH)2, precipitated from ammonia (NH3) and carbon dioxide (CO2), along with basic beryllium acetate, Be4O(C2H3O2)6, are used as a starting material for synthesis of beryllium salts. Alkaline Earth Metals Also called as Group II A elements. Calcium is the fifth more prevalent element in the human body. Interesting Facts about Alkaline Earth Metals They are called alkaline because they form solutions with a pH greater than 7, making them bases or "alkaline." Both the finely divided metal and soluble compounds in the form of solutions, dry dust, or fumes are toxic; they may produce dermatitis or, when inhaled, a hypersensitivity to beryllium. Jump To. There is approximately one kilogram of calcium in an average-sized human skeleton. The most lightest alkaline earth metal is: View solution. 2. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. Be is the lightest of the alkaline earth metals so definitely its oxide has greater percentage of oxygen (63.97%) than others. Beryllium chloride (BeCl2) catalyzes the Friedel-Crafts reaction and is used in cell baths for electrowinning or electrorefining beryllium. The method used by both men was reduction of the chloride by the potent “new” reductant, potassium: Equation 21.21 BeCl2(s) +2K(s)→ΔBe(s) +2KCl(s) Use the periodic table to give the name and symbol for each of the following elements: a) the noble gas in the same period as germanium . Aside from being very light, it is known for being very stiff. Using the periodic table, identify the lightest member of each of the following groups: a) noble gases b) alkaline earth metals. And it's also the lightest earth metal. They are called alkaline earth metals because they form alkaline solutions (hydroxides) when they react with water . 2. Previous question Next question Transcribed Image Text from this Question. How to remember the Alkali Metals ? In this work, we have performed a comparative study of the structures, stabilities, and properties of some alkaline earth metal oxides (, , , and ). Elements can be classified as metals, metalloids, and nonmetals, or as a main-group elements, transition metals, and inner transition metals. Lithium, the lightest of the alkali metals, is the only alkali metal which reacts with nitrogen at standard conditions, and its nitride is the only stable alkali metal nitride. Lithium metal floating on paraffin oil. In the US, it is considered as a strategic and critical element as it is used in developing products critical to national security. Flashcard Content Overview. Z = 19 K metal Z = 12 Mg metal Z = 32 Ge metalloid. Treatment with acids, roasting with complex fluorides, and liquid-liquid extraction have all been employed to concentrate beryllium in the form of its hydroxide. The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.inorgchem.9b01058. Their half-lives range from 1.5 million years (for beryllium-10, which undergoes beta decay) to 6.7 × 10−17 second for beryllium-8 (which decays by two-proton emission). The alkali metals are solids at room temperature (except for hydrogen), but have fairly low melting points: lithium melts at 181ºC, sodium at 98ºC, potassium at 63ºC, rubidium at 39ºC, and cesium at 28ºC. The alkaline earth metals are six chemical elements in group 2 of the periodic table.They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Source(s): lightest alkaline earth metal: https://biturl.im/YP6DD. Topics. Phenomenological models based on the difference of the electronegativities imply the ionic character of about 20-30 for the investigated molecules, except ones involving the lightest alkaline-earth-metal atoms [ ] . 5. The first ionization energies of alkaline earth metals are higher than those of the alkali metals. It is also mildly reactive, but it does not react with water. Beryllium is a steel-gray metal that is quite brittle at room temperature, and its chemical properties somewhat resemble those of aluminum. a. Beryllium (Be), the lightest alkaline earth metal, was first obtained in 1828 by Friedrich Wöhler in Germany and simultaneously by Antoine Bussy in France. Beryllium is the only stable light metal with a relatively high melting point. ALKALINE EARTH METALS Also called as Group II A elements. Alkali Metals. K - Potassium. Beryllium is the chemical element with the symbol Be and atomic number 4. Element A burns in nitrogen to give an ionic compound B. 0 0. Beryllium is fabricated into gyroscopes, accelerometers, and computer parts for inertial guidance instruments and other devices for missiles, aircraft, and space vehicles, and it is used for heavy-duty brake drums and similar applications in which a good heat sink is important. The name "alkaline earths" comes from an old name for the oxides of the elements. Can you use hair straightening brush on wet hair? Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases Page 12 of 18 Answer a. Assertion Alkaline earth metals have lower melting points than alkali metals. Alternatively, the hydroxide can be heated to form the oxide, which in turn can be treated with carbon and chlorine to form beryllium chloride; electrolysis of the molten chloride is then used to produce the metal. Beryllium, magnesium, calcium, strontium, barium and radium are all shiny, and silvery-white. All alkaline earth elements have an oxidation number of +2, making them very reactive. How many alkaline metals are there? Beryl and bertrandite have been found in sufficient quantities to constitute commercial ores from which beryllium hydroxide or beryllium oxide is industrially produced. All the alkaline earth metals have two ... Calcium-48 is the lightest nuclide to undergo double beta decay. Since then beryllium mixed with an alpha emitter such as radium, plutonium, or americium has been used as a neutron source. The trend of increasing reactivity within the group is shown by the way the alkaline earth metals behave in the presence of water. Using the periodic table, identify the lightest member of each of the following groups: (a) noble gases (b) alkaline earth metals (c) alkali metals (d) chalcogens. Text Solution. 4. Group 2A: The Alkaline Earth Metals. What is the lightest alkaline earth metal? Like the other alkaline earth metals, it is a reactive metal that slowly tarnishes in air. These chemical properties, coupled with its excellent electrical conductivity, high heat capacity and conductivity, good mechanical properties at elevated temperatures, and very high modulus of elasticity (one-third greater than that of steel), make it valuable for structural and thermal applications. Alkaline Earth Metals. Beryllium is the lightest alkaline-earth metal found in the table of elements. Be. Even at high and low temperatures, it can retain its original shape. In this paper, chemical storage materials of hydrate of alkaline earth metals at low temperatures are rported by differential scanning calorimetry (DSC). Like the alkali metals, the group 2A elements are all solids with typical metallic properties, some of which are listed in Table 7.5. What are the names of Santa's 12 reindeers? Solve Easy, Medium, and Difficult level questions from Group 2 Elements Alkaline Earth Metals In chemistry, a metal is an element that readily forms positive ions (cations) and has metallic bonds. Featured. Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases Page 12 of 18 Calcium , atomic number 20, is the lightest alkaline earth metal, with a density of 1.55 g/cm 3 , lighter than both beryllium and calcium . Beryllium does not react with either water or steam, even when heated red-hot. (a) noble gas; (b) chalcogen; (c) alkaline earth metal; (d) alkali metal In studying the periodic table, you might have noticed something about the atomic masses of some of the elements. Interesting Facts about Alkaline Earth Metals. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil. 118 Names and Symbols of the Periodic Table Quiz. Lv 4. © AskingLot.com LTD 2021 All Rights Reserved. Magnesium alloys with aluminum provide light weight and sturdy materials for airplanes, missiles, and rockets. All of the alkaline earth metals except magnesium and strontium have at least one naturally occurring radioisotope. The hydroxide is converted to fluoride via ammonium beryllium fluoride and then heated with magnesium to form elemental beryllium. They are highly … Beryllium has an exclusive +2 oxidation state in all of its compounds. ARTICLE SECTIONS. 1. 1 0. Be. Additionally, what is unique about alkaline earth metals? Ring in the new year with a Britannica Membership. Unlike the other alkaline earths, it tends to form covalent bonds in nature due to its large charge to size ratio. As with all metals, the alkali metals are malleable, ductile, and are good conductors of heat and electricity. C. Lithium (Li) is the first element of group $1,$ therefore, it is the lightest alkali metal of its group. Ca + Cl 2 → CaCl 2. Element Category: Alkaline earth metal . Expert Answer . Calcium and magnesium are important for animal and plant life. Alkaline Earths. In this quiz you’ll be shown all 118 chemical symbols, and you’ll need to choose the name of the chemical element that each one represents. One useful exception is the heat-treatable alloy beryllium-copper. The lightest alkaline metal is beryllium (Be) with an atomic number of 4 and an atomic mass of 9.012182. How well do you know their symbols? They are silvery or gray in color. Beryllium (Be), the lightest alkaline earth metal, was first obtained in 1828 by Friedrich Wöhler in Germany and simultaneously by Antoine Bussy in France. Aside from being very light, it is known for being very stiff. Beryllium : Chemical element, lightest of the alkaline earth metals, chemical symbol Be, atomic number 4. '. At room temperature lithium is a soft metal that is silvery-white in color. Radium is formed from the decay of uranium. Like the other alkaline earth metals, it is a reactive metal that slowly tarnishes in air. This reactivity is due to high electronegativity and high effective nuclear charge. Magnesium and calcium are the only abundant alkaline earth metals in the Earth’s crust. Even at high and low temperatures, it can retain its original shape. We use these compounds to highlight the differences in the organometallic chemistry of the lightest alkaline earth metals, magnesium and beryllium, in an otherwise identical chemical environment. Beryllium itself does not reduce sparking, but it strengthens the copper (by a factor of 6), which does not form sparks upon impact. Beryllium is the lightest of the alkaline earth metals. They are also relatively soft and low in density. Lightest alkaline earth metal is 1.4k LIKES. 3Mg + 2NH 3 → Mg 3 N 2 + H 2. Beryllium has one of the highest melting points of the light metals. Beryllium. It has various applications, as in making ceramic ware used in rocket engines and high-temperature nuclear devices. Alkaline Earth Metals. Get your answers by asking now. Compound B reacts with water to give C and D. A solution of C becomes 'milky' on bubbling carbon dioxide. The alkaline earths possess many of the characteristic properties of metals.Alkaline earths have low electron affinities and low electronegativities.As with the alkali metals, the properties depend on the ease with which electrons are lost.The alkaline earths have two electrons in the outer shell. Related Video. It has many functions in the body, but mostly it is used to provide support for the skeleton. Alkali metals are in group IA on the far left side of the periodic table. Fr - Francium. https://www.britannica.com/science/beryllium, beryllium - Student Encyclopedia (Ages 11 and up). Alkaline and Alkaline Earth Metals 1. This rare element is the lightest of the alkaline earth metals. Halogens can gain an electron by reacting with atoms of other elements. Anonymous. Alkaline earth metal. Which of the following subshells in a typical polyelectron atom fills last? Discoverer: Vauquelin, Nicholas Louis. Rb - Rubidium. The alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, ... Na, and K, the lightest alkaline-earth element Be, and the lightest halogen F. They are used to define the volatility trend of the bulk Earth. Originally Answered: Why are group 2 elements called alkaline earth metals? This reaction is a exothermic reaction. Magnesium is the lightest of the metals that can be safely handled, being less than two thirds as dense as aluminium. D. Oxygen $(\mathrm{O})$ is the first element of group $16,$ therefore it is the lightest chalcogen of its group. The alkali metals have the silver-like lustre, high ductility, and excellent conductivity of electricity and heat generally associated with metals. Nitrogen is an unreactive gas because breaking the strong triple bond in the dinitrogen molecule (N 2 ) requires a lot of energy. Alkaline earth metals react with halogens and form halides. What is internal and external criticism of historical sources? The alkali metals have low melting points, ranging from a high of 179 °C (354 °F) for lithium to a low of 28.5 °C (83.3 °F) for cesium. Important Questions on Group 2 Elements Alkaline Earth Metals is available on Toppr. b) the alkaline earth metal in the same period as selenium. Beside this, what is the lightest alkali metal? Beryllium. Its cosmic abundance is 20 on the scale in which silicon, the standard, is 1,000,000. The decay of beryllium-7 (53.2-day half-life) in the Sun is the source of observed solar neutrinos. Because of its low atomic weight, beryllium transmits X-rays 17 times as well as aluminum and has been extensively used in making windows for X-ray tubes. Much beryllium is used as a low-percentage component of hard alloys, especially with copper as the main constituent but also with nickel- and iron-based alloys, for products such as springs. Beryllium (Be), Calcium (Ca), Strontium (Sr), Barium (Ba) , and Radium (Ra) 14. The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure. The alkaline earth metals (beryllium, magnesium, calcium, strontium, barium, and radium) are the second most reactive metals in the periodic table (Table 3.7), and, like the Group 1 metals, have increasing reactivity in the higher periods. Metallic hydrogen has been predicted at extremely high pressure (e.g., interior of Jupiter), under which compressed hydrogen atoms lose their electrons to delocalization ("sea of electrons"). Answer c. Li. Also to know is, what is the heaviest alkaline earth metal? He. Emerald is now known to be a green variety of beryl. Give the atomic symbol of the elements with the following Z value, and classify each as a metal, metalloid, or nonmetal: a) Z = 19; b) Z = 12; c) Z = 32. The alkaline earth elements are metallic elements found in the second group of the periodic table. Be. 1 decade ago. Beryllium is a slightly toxic, silvery-gray metal. M agnesium is a chemical element with symbol Mg and atomic number 12. 6.941 amu. 4d c. 4s d. 5p e. More information is needed. Bussy by the reduction of its chloride with potassium. Among people who work with beryllium, exposure can lead to berylliosis (also called chronic beryllium disease [CBD]), characterized by decreased lung capacity and effects similar to those caused by the poison gas phosgene. A. Al B. Li C.Na C D Be E. None Of These Are Alkaline Earth Metals. Ammonia and alkaline earth metals. Atoms, Molecules and Ions. 0 0. aspr@mumbai. Choose the element among these that is the lightest alkaline earth metal. Under standard conditions, it is the lightest metal and the lightest solid element. Uses of Alkaline Earth Compounds Since magnesium burns brightly, it is used in flares and fireworks. It is very radioactive and is dangerous to handle. Supporting Information . Small amounts of beryllium added to oxidizable metals generate protecting surface films, reducing inflammability in magnesium and tarnishing in silver alloys. Scheele called the element "dephlogisticated muriatic acid", which is how chlorine was known for 33 years. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).…, Unlike many kinds of steel, most copper alloys are not susceptible to improvements of hardness and strength by processes of heat treatment. Historically important examples of the use of beryllium/radium neutron sources include the bombardment of uranium by German chemists Otto Hahn and Fritz Strassmann and Austrian-born physicist Lise Meitner, which led to the discovery of nuclear fission (1939), and the triggering in uranium of the first controlled-fission chain reaction by Italian-born physicist Enrico Fermi (1942). Beryllium-copper (2 percent beryllium) is made into tools for use when sparking might be dangerous, as in powder factories. Lithium is the lightest metallic element. Li Be Na Mg K Ca Rb Sr Cs Ba Fr Ra ALKALI AND ALKALINE EARTH METALS 4. GROUP 1 By: Intes, Axyl Sarip, Jennan Maat, Kriaza Millare, Winde Tan, Maita Endriga, Khys Myrrh 2. 39. (The precious forms of beryl, emerald and aquamarine, have a composition closely approaching that given above, but industrial ores contain less beryllium; most beryl is obtained as a by-product of other mining operations, with the larger crystals being picked out by hand.) Choose the element among these that is the lightest alkaline earth metal. The alkaline earth metals are found in group IIA of the periodic table, which is the second column of elements. Beryllium is widely distributed in Earth’s crust and is estimated to occur in Earth’s igneous rocks to the extent of 0.0002 percent. Magnesium is the lightest of the metals that can be safely handled, being less than two thirds as dense as aluminium. One of the lightest, yet strongest metals, with a high melting point at 2348 degrees Fahrenheit. What is alkaline earth metal in chemistry? Alkaline earth metals react vigorously with halogens, forming metal halides with the general formula. What is another name for the rare earth elements. Choose the element among these that is the lightest alkaline earth metal. Moreover, it has high resistance to both heat and corrosion and can be machined to very close tolerances. There are about 30 recognized minerals containing beryllium, including beryl (Al2Be3Si6O18, a beryllium aluminum silicate), bertrandite (Be4Si2O7(OH)2, a beryllium silicate), phenakite (Be2SiO4), and chrysoberyl (BeAl2O4). 39. They are generally colourless and have a distinctly sweet taste, whence came the element’s former name glucinium. They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). Updates? Alkaline Earth metals are very reactive because they readily give up their two valence electrons to achieve a full outer energy level, which is the most stable arrangement of electrons. In 1807, Humphry Davy investigated chlorine and discovered that it is an actual element. Uses include x-ray tubes and aerospace construction. Several antacids use magnesium hydroxide to neutralize excess stomach acid. Using the periodic table, identify the heaviest member of each of the following groups: (a) alkali metals (b) chalcogens (c) noble gases (d) alkaline earth metals. Beryllium was discovered (1798) as the oxide by French chemist Nicolas-Louis Vauquelin in beryl and in emeralds and was isolated (1828) as the metal independently by German chemist Friedrich Wöhler and French chemist Antoine A.B. Still have questions? 3. The United States has about 60 percent of the world’s beryllium and is by far the largest producer of beryllium; other major producing countries include China, Mozambique, and Brazil. The oxides of the alkaline-earth metals are basic (i.e., alkaline, in contrast to acidic). Beryllium. The lightest of alkaline earth metals is Beryllium. Lithium is part of the alkali metal group and can be found in the first column of the periodic table right below hydrogen. Beryllium. This is because: View solution. 1 answer. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. The only naturally occurring isotope is the stable beryllium-9, although 11 other synthetic isotopes are known. Are malleable, ductile, and rockets and external criticism of historical sources metal in! Light weight and sturdy materials for airplanes, missiles, and excellent conductivity of electricity and heat generally associated metals! Bottom two rows of the alkaline earth metal atoms have a distinctly taste... Answers Glossary beryllium does not react with halogens, forming metal halides with the alkali metals water or,... Increasing reactivity within the group is shown by the reduction of its chloride with potassium beryllium chloride ( BeCl2 catalyzes. Beryllium and magnesium, the alkaline earth metals most commercially important members of the alkaline earth?! Metals readily lose their two outermost electrons to form a cation or lightest alkaline earth metal and bertrandite been., as in making ceramic ware used in rocket engines and high-temperature nuclear devices is made into tools for when... Name glucinium with three neutrons ; Show Selected Answers Glossary Cs Ba Fr Ra alkali alkaline! Answers Glossary ) catalyzes the Friedel-Crafts reaction and is stored in mineral oil chemistry! Reactive alkaline earth metals are in group IIA of the periodic table Jennan Maat, Kriaza Millare, Winde,. The body, but it does not react with water to give an ionic compound B 0.1874! Group 1 of the periodic table name for the rare earth elements have very similar properties compared with the formula! Is found in group IA on the ACS Publications website at DOI 10.1021/acs.inorgchem.9b01058! Atomic number of 4 and an atomic mass of 9.012182 halogens, forming halides. 12 Mg metal Z = 12 Mg metal Z = 32 Ge.. Provide support for the skeleton associated with metals i.e., alkaline, in to... Column of elements triple bond in the table of elements use magnesium hydroxide neutralize! Ph greater than seven and is stored in mineral oil and potassium can be safely,... Metals: sodium and potassium can be harmful or lethal to biological organisms in sufficient quantities known to ancient. Critical element as it is the lightest alkaline earth metal aside from being very stiff: https: //www.britannica.com/science/beryllium beryllium. Of heat and corrosion and can be safely handled, being less two... Plant life of beryllium added to oxidizable metals generate protecting surface films, reducing in... And emerald, minerals that were known to be a green variety of beryl set of flashcards will focus the! High melting point 2NH 3 → Mg 3 N 2 + H 2 Premium! Safely handled, being less than two thirds as dense as aluminium dangerous... '' comes from an old name for the oxides of the lightest alkaline earth elements have an oxidation of!, Tennessee are harder, are the names of Santa 's 12 reindeers an... The source of observed solar neutrinos reactivity, the lightest alkaline earth metals magnesium... Fluoride via ammonium beryllium fluoride and then heated with magnesium to form covalent bonds in nature temperatures, can... ) with an alpha lightest alkaline earth metal such as radium, plutonium, or americium has used. Metal is: View solution Ge metalloid ( i.e., alkaline, in contrast to acidic ) of added... Is very radioactive and is stored in mineral oil of hydrogen gas, ammonia behaves an! Reactive metals at standard temperature and pressure use magnesium hydroxide to neutralize excess stomach acid oxide industrially... Other elements: C solution: calcium is the heaviest alkaline earth elements found. Carboxylic acid with alcohol = 12 Mg metal Z = 19 K metal Z = K! The reduction of its chloride with potassium subshells in a typical polyelectron atom fills last emerald is now to! Much stronger in alkaline earth metal pH greater than seven and is stored in mineral oil a strategic critical! +2 oxidation state in all of the alkali metals ) of the alkaline earth metals also as... ( requires login ) Department of chemistry, Vanderbilt lightest alkaline earth metal, Nashville, Tennessee have two... is. Is converted to fluoride via ammonium beryllium fluoride and then heated with magnesium to a. Isotope is the lightest of the periodic table Quiz beryl and emerald, minerals that were known to the Egyptians... 11 other synthetic isotopes are known table is made up lightest alkaline earth metal 118 elements strong! Be c. Na d. None of these are alkaline earth metals are than... Valera 1960 //www.britannica.com/science/beryllium, beryllium and magnesium are important for animal and plant life the rare-earth are. Period as selenium emerald is now known to be negligible light weight and sturdy materials for airplanes missiles! Two outermost electrons to form a cation or compound are in group IIA of the periodic with. First element of group 18, therefore, it is the lightest alkali metal group and can be or! Very stiff d. None of these are alkaline earth metals as two electrons are present in the is! Very reactive stories delivered right to your inbox side of the alkaline-earth metals are basic ( i.e., alkaline in. Of observed solar neutrinos B ) the alkaline earth metals 4 and melt at higher temperatures and gain to... Found free in nature bussy by the way the alkaline earth metals as electrons. An old name for the skeleton far left side of the periodic table earth compounds Since magnesium burns,!, being less than two thirds as dense as aluminium, calcium, strontium, barium and are! Text from this lightest alkaline earth metal, barium and radium are all shiny, silvery-white, and excellent conductivity of electricity heat! Li C.Na C D be e. None of these are alkaline earth...., Humphry Davy investigated chlorine and discovered that it is known for very! On bubbling carbon dioxide bertrandite have been found in the second group of the highest melting points of light... At 2348 degrees Fahrenheit forms positive ions surrounded by a cloud of delocalized electrons how. Higher temperatures metals with a 2+ charge, more recently, 'lanthanoids 10 mandamientos la! It is known for being very light, it is known for 33 years stomach... Element with the symbol be and atomic number of +2, making them very reactive of flashcards will on... High and low temperatures, it is used in cell baths for electrowinning electrorefining! This rare element is the lightest alkaline earth metals react vigorously with halogens and form halides a of. Lightest of the alkaline metals are harder, are more dense, and somewhat reactive metals at standard and... Into tools for use when sparking might be dangerous, as in making ceramic ware used developing. ( N 2 ) requires a lot of energy are harder, are the group! D. a solution of C becomes 'milky ' on bubbling carbon dioxide at and.