![[ATOM]](atom.gif) |
Tellurium
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Information valid for Te-128 unless otherwise noted
Basic Information
Symbol: Te
Atomic Number: 52
Mass: 127.6
Melting Point: 449.5 C
Boiling Point: 989.8 C
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
![[Bohr Model of Tellurium]](b0052.gif) |
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Number of Energy Levels: 5
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 18
Fifth Energy Level: 6
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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: 1728
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