Periodic Table
14
Si
28.085
Silicon
MetalloidSemiconductor; backbone of silicates and electronics.
Electronic Configuration
[Ne] 3s² 3p²or1s² 2s² 2p⁶ 3s² 3p²
Electron shells
2e⁻n=1
8e⁻n=2
4e⁻n=3
Properties
Atomic number
14
Atomic mass
28.085 u
Category
Metalloid
Block / Group / Period
p · 14 · 3
Valence electrons
4
Oxidation states
+4, -4
Electronegativity
1.9
Atomic radius
111 pm
Ionization energy
786 kJ/mol
Electron affinity
134 kJ/mol
Melting point
1687 K / 1414 °C
Boiling point
3538 K / 3265 °C
Density
2.33 g/cm³
State at 25 °C
solid
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