Periodic Table
51
Sb
121.76
Antimony
MetalloidMetalloid; flame retardants; alloy hardener.
Electronic Configuration
[Kr] 4d¹⁰ 5s² 5p³or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p³
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
18e⁻n=4
5e⁻n=5
Properties
Atomic number
51
Atomic mass
121.76 u
Category
Metalloid
Block / Group / Period
p · 15 · 5
Valence electrons
5
Oxidation states
-3, +3, +5
Electronegativity
2.05
Atomic radius
133 pm
Ionization energy
834 kJ/mol
Electron affinity
101 kJ/mol
Melting point
904 K / 631 °C
Boiling point
1860 K / 1587 °C
Density
6.685 g/cm³
State at 25 °C
solid
Personal Notes
Add personal notes for Antimony here...