Atomic Element Z = 51 • Metalloid
Antimony (Sb) — Atomic Data, Electron Shells & Reactions
Antimony (symbol Sb, atomic number 51) has a standard atomic weight of 121.76 u and ground-state configuration [Kr] 4d10 5s2 5p3.
Atomic Number (Z)
51
IUPAC Symbol
Sb
Standard Atomic Weight
121.76 g/mol
Period / Group / Block
5 / 15 / p-block
Condensed Electron Config
[Kr] 4d10 5s2 5p3
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p3
Principal Shell Occupancy
[2, 8, 18, 18, 5]
Pauling Electronegativity
2.05
First Ionization Energy
834 kJ/mol
Covalent Radius
139 pm
Melting Point
903.78 K (630.63 °C)
Boiling Point
1860 K (1586.85 °C)
Density
6.685 g/cm³
Oxidation States
+5, +3, -3
Sb (Z=51) — Valence shell highlighted in vermilion