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Basic Information

Name: TelluriumSymbol: TeAtomic Number: 52Atomic Mass: 127.6 amuMelting Point: 449.5 °C (722.65 K, 841.1 °F)Boiling Point: 989.8 °C (1262.95 K, 1813.64 °F)Number of Protons/Electrons: 52Number of Neutrons: 76Classification: MetalloidCrystal Structure: HexagonalDensity

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293 K:
6.24 g/cm3Color: silverish

Atomic Structure

Number of Energy Levels: 5First Energy Level: 2Second Energy Level: 8Third Energy Level: 18Fourth Energy Level: 18Fifth Energy Level: 6


IsotopeHalf Life
Te-1194.69 days
Te-12116.8 days
Te-121m154.0 days
Te-1231.3E12 years
Te-123m119.7 days
Te-125m58.0 days
Te-1279.4 hours
Te-127m109.0 days
Te-1291.16 hours
Te-129m33.6 days
Te-1302.5E21 years
Te-13125.0 minutes
Te-131m1.35 days
Te-1323.26 days
Te-13312.4 minutes
Te-133m55.4 minutes
Te-13441.8 minutes


Date of Discovery: 1782Discoverer: Franz Muller von ReichensteinName Origin: From the Greek word tellus (Earth)Uses: coloring of glass and ceramics, thermoelectric devicesObtained From: by-product of refining of lead and copper

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