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3Li6.940
Lithium
Alkali MetalLithium (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.
Phase: SolidAppearance: silvery-white
2, 1
Physical Properties
Atomic Mass6.94 u
Density0.534 g/cm³
Melting Point453.65 K
Boiling Point1603 K
Molar Heat24.86 J/(mol·K)
Period2
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s1
Semantic Config[He] 2s1
Shells2, 1
Electron Affinity59.6326 kJ/mol
Electronegativity0.98
Ionization Energies
IE1: 520.2 kJ/molIE2: 7298.1 kJ/molIE3: 11815 kJ/mol
Discovery
Discovered byJohan August Arfwedson