Silicon

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	14
Element	Silicon
Symbol	Si
Atomic Mass	28.085 u
Number of Neutrons	14 (most common isotope, Silicon-28)
Number of Protons	14
Number of Electrons	14
Period	3
Group	14
Phase	Solid
Radioactive	No
Natural	Yes
Metal	No
Nonmetal	No
Metalloid	Yes
Type	Metalloid
Atomic Radius	111 pm
Electronegativity	1.90 (Pauling scale)
First Ionization Energy	8.152 eV
Density	2.33 g/cm³
Melting Point	1414 °C
Boiling Point	3265 °C
Number of Isotopes	3 stable (Silicon-28, Silicon-29, Silicon-30)
Discoverer	Jöns Jacob Berzelius
Year	1824
Specific Heat	0.705 J/g·K
Number of Shells	3
Number of Valence Electrons	4