Chemical element · Atomic number 52
Tellurium
Tellurium in the periodic table: atomic number 52, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Metalloid
solid
127.6 u
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Atomic classification
Shell occupancy
Tellurium 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
- 6 electrons
- Electron configuration
- [Kr]5s2 4d10 5p4
- Electrons per shell
- 2 · 8 · 18 · 18 · 6
- Group
- 16
- Period
- 5
- Block
- P
- Element category
- Metalloid
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Physical and chemical properties
- Atomic mass
- 127.6 u
- Standard state
- solid
- Density
- 6.232 g/cm³
- Melting point
- 722.66 K
- Boiling point
- 1,261 K
- Electronegativity
- 2.1 (Pauling)
- First ionisation energy
- 9.01 eV
- Oxidation states
- +6, +4, -2
- Discovery
- 1782
Safety and periodic classification
Safety
Safe handling cannot be inferred from Tellurium'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
Tellurium is in period 5, group 16 and the P block. Its direct neighbours by atomic number are Antimony and Iodine. The recorded Pauling electronegativity is 2.1. 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.