052Metalloid · Group 16 · Period 5
Tellurium
Tellurium (Te) is element 52, a metalloid in the p-block — group 16, period 5. It is a solid at room temperature with 5 electron shells (2, 8, 18, 18, 6) and an atomic mass of 127.603 u.
- Atomic mass
- 127.6 u
- Phase · STP
- solid
- Melting
- 723 K · 450 °C
- Boiling
- 1261 K · 988 °C
- Electronegativity
- 2.1
- Density
- 6.24 g/cm³
Photograph — Unknown authorUnknown author, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0>, via Wikimedia Commons, source: https://images-of-elements.com/tellurium.php
Identity
- Atomic number
- 52
- Standard atomic weight
- 127.6 u
- Category
- Metalloid
- Group
- 16 · Chalcogens
- Period
- 5
- Block
- p-block
- Oxidation states
- +6, +4, -2
Physical properties
- Melting point
- 723 K · 450 °C
- Boiling point
- 1261 K · 988 °C
- Density
- 6.24 g/cm³
- Molar heat capacity
- 25.73 J/(mol·K)
- Atomic radius
- 206 pm
- Electron affinity
- 190.161 kJ/mol
Atomic structure
52protons
76neutrons
52electrons
6valence e⁻
- Noble-gas notation
- [Kr] 4d10 5s2 5p4
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4
- Electrons per shell
- 2, 8, 18, 18, 6
Periodic trends
Where Tellurium ranks across all 118 elements.
Ionization energies
Energy to remove each successive electron (kJ/mol).
869.31
1.8k2
2.7k3
3.6k4
5.7k5
6.8k6
13.2k7
Successive ionization energies (kJ/mol, log scale).
Discovery
- Discovered
- 1782
- Discovered by
- Franz-Joseph Müller von Reichenstein
- Named by
- —
- Appearance
- —