Period 2 element two make up all natural occurrence of lithium on Earth, although further isotopes have been synthesized. In ionic compounds, lithium loses an electron to become positively charged, forming the cation Li. Lithium is the first alkali metal in the periodic table, and the first metal of any kind in the periodic table. At standard temperature and pressure, lithium is a soft, silver-white, highly reactive metal. With a density of 0.564 g·cm, lithium is the lightest metal and the least dense solid element. Lithium is one of the few elements synthesized in the Big Bang, making it a primordial element. Lithium
Solid nitrogen transparent sheet layer of annealed nitrogen ice, often referred to as a "glaze". Geysers of nitrogen gas were observed by "Voyager 2" to spew from the subpolar regions around Triton's southern polar ice cap. A possible explanation of this observed phenomenon is that the sun shines through the transparent layer of nitrogen ice, heating the layers beneath. Nitrogen sublimes and eventually erupts through holes in the upper layer, carrying dust along with it and creating dark streaks. Solid nitrogen Solid nitrogen is the solid form of the element nitrogen. It is an important component of the surfaces of Pluto and