Silicon

Document v1 · published by Koskamo · updated 2026-10-04

Silicon (Si) is chemical element 14, a metalloid in group 14, period 3 (PubChem).

Atomic number: 14
Symbol: Si
Group: 14
Period: 3
Atomic mass: 28.085 u
Electron configuration: [Ne]3s2 3p2
Electronegativity (Pauling scale): 1.9
Atomic radius (van der Waals): 210 pm
Ionization energy: 8.152 eV
Electron affinity: 1.385 eV
Oxidation states: +4, +2, -4
Standard state: Solid
Melting point: 1687 K
Boiling point: 3538 K
Density: 2.3296 g/cm³
Chemical group: Metalloid
Year discovered: 1854

Source and provenance

Original source: pubchem.ncbi.nlm.nih.gov
Published on Koskamo by: Koskamo
Citation version: Document v1
Reuse: PubChem periodic table data (NIH/NLM, pubchem.ncbi.nlm.nih.gov/ptable); group and period from Jefferson Lab via PubChem

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Version history

Published by Koskamo2026-10-04
Version 1