Atomic Element Z = 31 • Post-Transition Metal
Gallium (Ga) — Atomic Data, Electron Shells & Reactions
Gallium (symbol Ga, atomic number 31) has a standard atomic weight of 69.723 u and ground-state configuration [Ar] 3d10 4s2 4p1.
Atomic Number (Z)
31
IUPAC Symbol
Ga
Standard Atomic Weight
69.723 g/mol
Period / Group / Block
4 / 13 / p-block
Condensed Electron Config
[Ar] 3d10 4s2 4p1
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1
Principal Shell Occupancy
[2, 8, 18, 3]
Pauling Electronegativity
1.81
First Ionization Energy
579 kJ/mol
Covalent Radius
122 pm
Melting Point
302.91 K (29.76 °C)
Boiling Point
2673 K (2399.85 °C)
Density
5.907 g/cm³
Oxidation States
+3
Ga (Z=31) — Valence shell highlighted in vermilion