Tellurium (Te)
Tellurium is the chemical element with atomic number 52 and symbol Te. It is a metalloid in period 5, group 16, with a standard atomic weight of 127.6 u.
Key facts
- Z
- 52
- Atomic weight
- 127.6 u
- Category
- metalloid
- State at 298 K
- Solid
- Occurrence
- primordial
- Discovered
- 1783
- CAS
- 13494-80-9
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 2.1 | National Center for Biotechnology Information (NIH) |
| Melting point | 722.66 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 1,261 K | National Center for Biotechnology Information (NIH) |
| Density stp | 6.232 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 206 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 869.3 kJ/mol | National Center for Biotechnology Information (NIH) |
| Electron affinity | 190.2 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Kr] 4d¹⁰ 5s² 5p⁴
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁴
- Electrons per shell
- 2, 8, 18, 18, 6