Tellurium

Element 52 on the periodic table, symbol Te, group 16, period 5.

Tellurium is a chemical element with symbol Te and atomic number 52. It is a brittle, mildly toxic, rare, silver-white metalloid. Tellurium is chemically related to selenium and sulfur.

Properties

Atomic Number: 52
Atomic Mass: 127.6030 u
Group: 16
Period: 5
Block: p-block
Category: Metalloid
State at 25 °C: Solid
Melting Point: 722.7 K · 449.5 °C
Boiling Point: 1,261 K · 987.9 °C
Density: 6.24 g/cm³
Atomic Radius: 140 pm
Electronegativity: 2.1
Oxidation States: -2, +4, +6
Abundance in Crust: 0.001 mg/kg
Discovered: 1782
Discovered By: Franz-Joseph Müller von Reichenstein

Electron Configuration

[Kr] 4d10 5s2 5p4

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p4

Ionisation Energies (kJ/mol)

1. 869.3
2. 1,790
3. 2,698
4. 3,610
5. 5,668
6. 6,820
7. 13,200

Elements near Tellurium

Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.