Periodic Table
52
Te
127.6
Tellurium
MetalloidMetalloid; one of few with mass anomaly (Te>I) — fixed by atomic number.
Electronic Configuration
[Kr] 4d¹⁰ 5s² 5p⁴or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p⁴
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
18e⁻n=4
6e⁻n=5
Properties
Atomic number
52
Atomic mass
127.6 u
Category
Metalloid
Block / Group / Period
p · 16 · 5
Valence electrons
6
Oxidation states
-2, +4, +6
Electronegativity
2.1
Atomic radius
123 pm
Ionization energy
869 kJ/mol
Electron affinity
190 kJ/mol
Melting point
723 K / 450 °C
Boiling point
1261 K / 988 °C
Density
6.232 g/cm³
State at 25 °C
solid
Personal Notes
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