31Ga
Gallium
갈륨 · ガリウム
Post-transition
Atomic number31
ElementGa — Gallium
Atomic mass69.723
CategoryPost-transition
Group13
Period4
Electron config[Ar] 3d10 4s2 4p1
Shells2,8,18,3
State (RT)Solid
Melting pt30°C
Boiling pt2204°C
Electronegativity1.81
Discovered1875
Main usesLEDs, semiconductors
2 · 8 · 18 · 3