Atomic Properties of Te
- Atomic Number of Te
- 52
- Atomic Mass of Te
- 127.6000 u
- Electron Configuration
- [Kr] 4d10 5s2 5p4
- Electronegativity
- 2.10
- Block
- p-block
- Group
- 16
- Period
- 5
Tellurium is easier to notice by effect than by abundance. It is a scarce, silvery metalloid usually recovered as a by-product of copper refining, yet small amounts can change how other materials behave. Added to copper or steel, tellurium can make the metal easier to machine. Combined with cadmium, it forms a semiconductor that converts sunlight into electricity in thin-film solar cells.
Its thermal talent points in the opposite direction. Telluride materials can help turn a temperature difference into electrical voltage, or use electrical current to move heat. That thermoelectric behavior supports specialized cooling and power-generation devices with few or no moving parts. Tellurium works where heat and charge meet.
The element also leaves an oddly personal calling card. Exposure to some tellurium compounds can lead the body to produce volatile substances with a garlic-like odor. The smell is real chemistry, though it is not a safe invitation to investigate compounds directly.
Even its natural isotopes are contrarians. Tellurium-128 and tellurium-130 are radioactive, but their double-beta decays are so extraordinarily slow that they persist in nature alongside six stable isotopes. Tellurium-128 has a half-life vastly longer than the age of the universe.
Tellurium sits near the boundary between metals and nonmetals, turns sunlight into current, turns heat gradients into voltage, and makes radioactivity look almost motionless. For a relatively obscure element, it specializes in memorable reversals.