Tellurium

Koushik 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08

Property	Value
Atomic Number	52
Element	Tellurium
Symbol	Te
Atomic Mass	127.60 u
Number of Neutrons	76 (most common isotope, Tellurium-128)
Number of Protons	52
Number of Electrons	52
Period	5
Group	16
Phase	Solid
Radioactive	No (some isotopes are weakly radioactive)
Natural	Yes
Metal	No
Nonmetal	No
Metalloid	Yes
Type	Metalloid
Atomic Radius	123 pm
Electronegativity	2.10 (Pauling scale)
First Ionization Energy	9.010 eV
Density	6.24 g/cm³
Melting Point	449.51 °C
Boiling Point	988 °C
Number of Isotopes	8 naturally occurring (Te-120, Te-122, Te-123, Te-124, Te-125, Te-126, Te-128, Te-130)
Discoverer	Franz-Joseph Müller von Reichenstein
Year	1782
Specific Heat	0.202 J/g·K
Number of Shells	5
Number of Valence Electrons	6