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
Vapor pressures of the elements (data page) online version (1954; Knovel 2003). Table 363, Evaporation of Metals Vapor pressures of the elements (data page) David R. Lide (ed), "CRC Handbook of Chemistry and Physics, 84th Edition". CRC Press. Boca Raton, Florida, 2003; Section 6, Fluid Properties; Vapor Pressure David R. Lide (ed), "CRC Handbook of Chemistry and Physics, 84th Edition", online version. CRC Press. Boca Raton, Florida, 2003; Section 4, Properties of the Elements and Inorganic Compounds; Vapor Pressure of the Metallic Elements National Physical Laboratory, "Kaye and Laby Tables of Physical and Chemical Constants"; Section 3.4.4, D. Ambrose, Vapour pressures from 0.2 to 101.325 kPa. Retrieved