Atomic Element Z = 3 • Alkali Metal
Lithium (Li) — Atomic Data, Electron Shells & Reactions
Lithium (symbol Li, atomic number 3) has a standard atomic weight of 6.94 u and ground-state configuration [He] 2s1.
Atomic Number (Z)
3
IUPAC Symbol
Li
Standard Atomic Weight
6.94 g/mol
Period / Group / Block
2 / 1 / s-block
Condensed Electron Config
[He] 2s1
Full Subshell Config
1s2 2s1
Principal Shell Occupancy
[2, 1]
Pauling Electronegativity
0.98
First Ionization Energy
520 kJ/mol
Covalent Radius
128 pm
Melting Point
453.65 K (180.50 °C)
Boiling Point
1603 K (1329.85 °C)
Density
0.534 g/cm³
Oxidation States
+1
Li (Z=3) — Valence shell highlighted in vermilion