Lithium (Li)

From Wikipedia, the free encyclopediaLithium (from Greek:λίθος lithos, "stone") is a chemical element with the symbol Li and atomic number 3. It is a soft, silver-white metal belonging to the alkali metal group of chemical elements. Under standard conditions it is the lightest metal and the least dense solid element.

Lithium in the periodic table

SymbolLi
Atomic number3
Group1
Period2
Blocks
Element categoryAlkali Metal

Physical properties

Phase at STPSolid
Density0.534 g/cm3
Atomic weight6.94 u
Melting point453.65 K
180.5 °C
356.9 °F
Boiling point1603 K
1329.85 °C
2425.73 °F

Atomära egenskaper

Electronegativity (Pauling Scale)0.98
Electron affinity59.6326 kJ/mol
Ionization energies
1520.2 kJ/mol
2 7298.1 kJ/mol
3 11815 kJ/mol

Electron configuration

Electron configuration1s2 2s1
Electrons per shell2, 1

History

Discovered1817
Discovered byJohan August Arfwedson