Periodic table / Metalloids
14Silicon
Silicon is a metalloid in group 14, period 3. At 25 °C it is a solid.
- Symbol
- Si
- Atomic number
- 14 protons in the nucleus
- Standard atomic weight
- 28.085 ± 0.001
- Electron configuration
- [Ne] 3s2 3p2
- Electrons in each shell
- 2, 8, 4
- Group, period, block
- 14, 3, p
- Family
- Metalloids
- State at 25 °C
- solid
- Electronegativity
- 1.9 (Pauling scale)
- First ionisation energy
- 786.5 kJ/mol (8.15168 eV)
Where these numbers come from
Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.