Gallium

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	31
Element	Gallium
Symbol	Ga
Atomic Mass	69.723 u
Number of Neutrons	39 (most common isotope, Gallium-69)
Number of Protons	31
Number of Electrons	31
Period	4
Group	13
Phase	Solid (melts near room temperature)
Radioactive	No
Natural	Yes
Metal	Yes
Nonmetal	No
Metalloid	No
Type	Post-transition Metal
Atomic Radius	136 pm
Electronegativity	1.81 (Pauling scale)
First Ionization Energy	5.999 eV
Density	5.91 g/cm³
Melting Point	29.76 °C
Boiling Point	2403 °C
Number of Isotopes	2 stable (Gallium-69, Gallium-71)
Discoverer	Paul-Émile Lecoq de Boisbaudran
Year	1875
Specific Heat	0.371 J/g·K
Number of Shells	4
Number of Valence Electrons	3