Chemical element · Atomic number 51
Antimony
Antimony in the periodic table: atomic number 51, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Metalloid
solid
121.760 u
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Atomic classification
Shell occupancy
Antimony in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 18 electrons
- O · n=5
- 5 electrons
- Electron configuration
- [Kr]5s2 4d10 5p3
- Electrons per shell
- 2 · 8 · 18 · 18 · 5
- Group
- 15
- Period
- 5
- Block
- P
- Element category
- Metalloid
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Physical and chemical properties
- Atomic mass
- 121.760 u
- Standard state
- solid
- Density
- 6.685 g/cm³
- Melting point
- 903.78 K
- Boiling point
- 1,860 K
- Electronegativity
- 2.05 (Pauling)
- First ionisation energy
- 8.64 eV
- Oxidation states
- +5, +3, -3
- Discovery
- known since antiquity
Safety and periodic classification
Safety
Safe handling cannot be inferred from Antimony's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Antimony is in period 5, group 15 and the P block. Its direct neighbours by atomic number are Tin and Tellurium. The recorded Pauling electronegativity is 2.05. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.