SymbolGa
Latin nameGallium
Atomic number31
Period4
Element categoryMetals
Relative atomic mass69.723
GroupIII.A
Electronegativity
1.6
Oxidation numbers
3
Electron configuration
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1
Density [g/cm3]
5.93
State
Solid
Melting point [°C]
29.78
Boiling point [°C]
2403
Atomic radius [pm]
135
Covalent radius [pm]
122
Thermal conductivity [W m-1K-1]
40.6
Heat capacity [J K-1g-1]
0.371
Discovery
1875
Hardness [Mohs scale]
1.5
Brinell hardness [MPa]
60
Electrical conductivity [S m-1]
7.1 · 106
1.st ionization energy [eV]
5.9993
2.nd ionization energy [eV]
20.51
3.rd ionization energy [eV]
30.71
Stable isotopes
2
Unstable isotopes
11