Ga
Gallium · element 31
Post-Transition Metal · Solid at room temperature
Gallium is a chemical element with symbol Ga and atomic number 31. Elemental gallium does not occur in free form in nature, but as the gallium(III) compounds that are in trace amounts in zinc ores and in bauxite. Gallium is a soft, silvery metal, and elemental gallium is a brittle solid at low temperatures, and melts at 29.76 °C (85.57 °F) (slightly above room temperature).
Key facts
Atomic mass
69.7231 u
how heavy one atom is
Phase (room temp.)
Solid
Density
5.91 g/cm³
how tightly packed it is
Melting point
302.915 K (30 °C)
when solid turns to liquid
Boiling point
2673 K (2400 °C)
when liquid turns to gas
Period
4
its row in the periodic table
Group
13
its column in the periodic table
Block
P-block
the neighbourhood it lives in
Electronegativity
1.81
how strongly it pulls electrons
Electron configuration
[Ar] 3d10 4s2 4p1
where its electrons live
Shells
2 · 8 · 18 · 3
electrons in each layer, inside to out
Discovered by
Lecoq de Boisbaudran
who found it
Appearance
silver-white
what it looks like
Source: Wikipedia