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
Crystal Structure: Hexagonal
Density @ 293 K: 6.24 g/cm3
Color: silverish
Atomic Structure
![[Bohr Model of Tellurium]](b0052.gif) |
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 |
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: 1782Discoverer: 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
Information provided by: http://www.chemicalelements.com