Atomic number 14
Name Silicon
Atomic mass 28.0855(3)
Electronic configuration [Ne] 3s2 3p2
Electronegativity 1.9
Atomic radius 111 pm
Ion radius 40 (+4) pm
Van der Waals radius 210 pm
Ionization energy 787 kJ/mol
Electron affinity -134 kJ/mol
Oxidation states -4, -3, -2, -1, 1, 2, 3, 4
Standard physical state solid
Bonding type metallic
Melting point 1687 °C
Boiling point 3173 °C
Density 2.33 g/cm³
Type metalloid
Year discovered 1854