Lithium
Chemical element
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Lithium is a chemical element; it has symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid element. Wikipedia
Symbol: Li
Atomic number: 3
Atomic mass: 6.941 u
Discoverer: Johan August Arfwedson
Melting point: 357°F (180.5°C)
Boiling point: 2,448°F (1,342°C)
Electron configuration: 1s²2s¹