Periodic Table
31
Ga
69.723
Gallium
Post-transitionMelts in your hand (~30°C); predicted as eka-aluminium by Mendeleev.
Electronic Configuration
[Ar] 3d¹⁰ 4s² 4p¹or1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p¹
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
3e⁻n=4
Properties
Atomic number
31
Atomic mass
69.723 u
Category
Post-transition
Block / Group / Period
p · 13 · 4
Valence electrons
3
Oxidation states
+3
Electronegativity
1.81
Atomic radius
136 pm
Ionization energy
579 kJ/mol
Electron affinity
29 kJ/mol
Melting point
303 K / 30 °C
Boiling point
2477 K / 2204 °C
Density
5.91 g/cm³
State at 25 °C
solid
Personal Notes
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