Chemical Elements.com - Tellurium (Te)

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Basic Information

Name: Tellurium
Symbol: Te
Atomic Number: 52
Atomic Mass: 127.6 amu
Melting 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: 52
Number of Neutrons: 76
Classification: Metalloid
Crystal Structure: Hexagonal
Density @ 293 K: 6.24 g/cm³
Color: silverish

Atomic Structure

Number of Energy Levels: 5

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Isotopes

Isotope	Half Life
Te-119	4.69 days
Te-120	Stable
Te-121	16.8 days
Te-121m	154.0 days
Te-122	Stable
Te-123	1.3E12 years
Te-123m	119.7 days
Te-124	Stable
Te-125	Stable
Te-125m	58.0 days
Te-126	Stable
Te-127	9.4 hours
Te-127m	109.0 days
Te-128	Stable
Te-129	1.16 hours
Te-129m	33.6 days
Te-130	2.5E21 years
Te-131	25.0 minutes
Te-131m	1.35 days
Te-132	3.26 days
Te-133	12.4 minutes
Te-133m	55.4 minutes
Te-134	41.8 minutes

Facts

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

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