Silicon

Symbol | Si
Latin name | Silicium
Atomic number | 14
Period | 3
Element category | Metalloids
Relative atomic mass | 28.0855
Group | IV.A
Electronegativity | 1.8
Oxidation numbers | -4, 4
Electron configuration | 1s2 2s2 2p6 3s2 3p2
Density [g/cm3] | 2.332
State | Solid
Melting point [°C] | 1410
Boiling point [°C] | 2355
Atomic radius [pm] | 111
Covalent radius [pm] | 111
Thermal conductivity [W m-1K-1] | 148
Heat capacity [J K-1g-1] | 0.70
Discovery | 1824
Hardness [Mohs scale] | 7.0
Young's modulus [GPa] | 47
Electrical conductivity [S m-1] | 4 · 102
1.st ionization energy [eV] | 8.1517
2.nd ionization energy [eV] | 16.345
3.rd ionization energy [eV] | 33.492
Stable isotopes | 3
Unstable isotopes | 5