Metalloid

Silicon

Silicon (Si) has atomic number 14. PubChem classifies it as metalloid.

Atomic number

14

Symbol

Si

Atomic weight (source value)

28.085

Electron configuration

[Ne]3s2 3p2

Standard state

Solid

Electronegativity (Pauling)

1.9

Melting point (K)

1687

Boiling point (K)

3538

Density (g/cm³)

2.3296

Oxidation states

+4, +2, -4

Understanding this entry

Atomic number is the number of protons in the nucleus. Properties are reference values and may depend on conditions and measurement conventions. An atomic weight is not the mass of every isotope. For elements without a standard atomic weight, a source may report an isotope mass number. Blank source values are shown as unavailable rather than estimated.

Further reading and reference: NIH PubChem source dataset ↗. Values and educational summaries are not a substitute for specialised advice.