The name xenon for this gas comes from the Greek word ξένον [xenon], neuter singular form of ξένος [xenos], meaning ‘foreign(er)’, ‘strange(r)’, or ‘guest’.
Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral).Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids.Uranium is a silvery-white metal in the actinide series of the periodic table.

These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.Silver is a soft, white, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Zinc's full electron configuration is: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10. Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten.Neptunium metal is silvery and tarnishes when exposed to air. Lead is soft and malleable, and has a relatively low melting point. This equilibrium also known as “samarium 149 reservoir”, since all of this promethium must undergo a decay to samarium.Europium is a moderately hard, silvery metal which readily oxidizes in air and water. The maximum electrons that can be carried by the sub-shell S is 2, by P is 6, by D is 10, and the F sub-shell can carry 14. The electron configuration of potassium (K) is: 1s2 2s2 2p6 3s2 3p6 4s1 or the shorthand configuration: [Ar]4s1 Francium is the second-least electronegative element, behind only caesium, and is the second rarest naturally occurring element (after astatine). Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite.Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Uranium has the highest atomic weight of the primordially occurring elements. There are no "one-electron solutions" for systems of more than one electron, only a set of many-electron solutions that cannot be calculated exactlyThe fact that the aufbau principle is based on an approximation can be seen from the fact that there is an almost-fixed filling order at all, that, within a given shell, the s-orbital is always filled before the p-orbitals.

Tungsten is an intrinsically brittle and hard material, making it difficult to work.Rhenium is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table.Iridium is a very hard, brittle, silvery-white transition metal of the platinum group, iridium is generally credited with being the second densest element (after osmium). The electron configuration is the distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals. Its boiling point is the lowest among all the elements.It is a soft, silvery-white alkali metal. If you continue to use this site we will assume that you are happy with it.
and Gay-Lussac, L.-J.Discoverer: Priestley, Joseph and Scheele, Carl WilhelmDiscoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh)Discoverer: Del Rio, Andrés Manuel (1801) and Sefström, Nils Gabriel (1830)Discoverer: Ramsay, Sir William and Travers, MorrisDiscoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav RobertDiscoverer: Reich, Ferdinand and Richter, HieronymusDiscoverer: Ramsay, William and Travers, Morris WilliamLanthanoids comprise the 15 metallic chemical elements with atomic numbers 57 through 71, from lanthanum through lutetium. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table.Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide.

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