Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air. It has an estimated density ofÂ 40.7 x 103Â kg/m3. TheÂ chemical symbolÂ for Praseodymium isÂ Pr. TheÂ chemical symbolÂ for Osmium isÂ Os. Neptunium metal is silvery and tarnishes when exposed to air. Sodium plasma ("vapor") lamps are often used for street lighting in cities, shedding light that ranges from yellow-orange to peach as the pressure increases. Copper is used as a conductor of heat and electricity, as a building material, and as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins. TheÂ chemical symbolÂ for Xenon isÂ Xe. ManganeseÂ is a chemical element withÂ atomic numberÂ 25Â which means there are 25 protons and 25 electrons in the atomic structure. TheÂ chemical symbolÂ for Calcium isÂ Ca. TheÂ chemical symbolÂ for Astatine isÂ At. SinceÂ nucleonsÂ (protonsÂ andÂ neutrons) make up most of the mass of ordinary atoms, the density of normal matter tends to be limited by how closely we can pack these nucleons and depends on the internal atomic structure of a substance. TheÂ chemical symbolÂ for Europium isÂ Eu. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite. It is even less abundant than the so-called rare earths. 2) You may not distribute or commercially exploit the content, especially on another website. We know that the atomic number of sodium is 11. TheÂ chemical symbolÂ for Rhenium isÂ Re. It is a soft, silvery-white alkali metal. TheÂ chemical symbolÂ for Neodymium isÂ Nd. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Explanation: hope you got your answer plzz brainlist me GoldÂ is a chemical element withÂ atomic numberÂ 79Â which means there are 79 protons and 79 electrons in the atomic structure. For example,Â 63CuÂ (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in itsÂ nuclear ground state is 62.91367 u. Very soft and malleable, indium has a melting point higher than sodium and gallium, but lower than lithium and tin. RhodiumÂ is a chemical element withÂ atomic numberÂ 45Â which means there are 45 protons and 45 electrons in the atomic structure. It is even less abundant than the so-called rare earths. Sodium is a soft, silvery-white, highly reactive metal.  Another heat transfer application is poppet valves in high-performance internal combustion engines; the valve stems are partially filled with sodium and work as a heat pipe to cool the valves. HydrogenÂ is a chemical element withÂ atomic numberÂ 1Â which means there are 1 protons and 1 electrons in the atomic structure.
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