Recognised as Chemical element
Antimony
- Sb
- Z = 51
- metalloid
Antimony (Sb) is element 51, a metalloid in period 5 and group 15. Its standard atomic weight is 121.76 Da. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolSb
Standard atomic weight121.76atomic mass units (Da)
Mass in kilograms2.0218724 × 10^-25
Categorymetalloid
Group15
Period5
Blockp-block
Electrons in a neutral atom51
Neutrons in the most common isotope71≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p³ground state, subshells written in order of n
Noble gas shorthand[Kr] 4d¹⁰ 5s² 5p³
Electrons per shell2, 8, 18, 18, 5K, L, M and outward
Electrons in the outer shell5
Unpaired electrons3Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleFollowedthe ground state is what the n + l filling order predicts
Quantities
Molar mass121.76 g/mol
Mass of one mole121.76 grams
Atoms in one gram4.9459106 × 10^21
Mass of one atom2.0218724 × 10^-22 g
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