Silicon

Metalloid · 28.085 u · group 14, period 3

Silicon · Si

Atomic number14

SymbolSi

CategoryMetalloid

Standard stateSolid

Group · Period · Block14 · 3 · p

Electron configuration[Ne]3s2 3p2

Atomic mass28.085 u

Atomic radius210 pm

Protons / Neutrons / Electrons14 / 14 / 14

Shells (e⁻ per shell)2, 8, 4

Electronegativity (Pauling)1.9

Ionization energy8.152 eV

Electron affinity1.385 eV

Oxidation states+4, +2, -4

Melting point1.69e+3 K · 1.41e+3 °C

Boiling point3.54e+3 K · 3.26e+3 °C

Density2.3296 g/cm³

Year discovered1854

CPK color

#F0C8A0

State at room temp (25 °C)

solid

Position

3 in library