Tellurium |
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
Number of Energy Levels: 5
|
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 |
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