![[ATOM]](atom.gif) |
Iodine
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Information valid for I-127 unless otherwise noted
Basic Information
Symbol: I
Atomic Number: 53
Mass: 126.904
Melting Point: 113.5
Boiling Point: 184
Number of Protons/Electrons: 53
Number of Neutrons: 74
Classification: Halogen
Crystal Structure: Orthorhombic
Density: 4.93
Color: blackish
Atomic Structure
![[Bohr Model of Iodine]](b0053.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: 7
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Isotopes
| Isotope |
Half Life |
| I-122 |
3.6 minutes |
| I-123 |
13.2 hours |
| I-124 |
4.2 days |
| I-125 |
60.1 days |
| I-126 |
13 days |
| I-127 |
Stable |
| I-128 |
25 minutes |
| I-129 |
1.57e+007 years |
| I-130 |
12.4 hours |
| I-131 |
8 days |
| I-132 |
2.3 hours |
| I-133 |
20.8 hours |
| I-134 |
52.6 minutes |
| I-135 |
6.6 hours |
| I-136 |
1.4 minutes |
Facts
Date of Discovery: 1804
Discoverer: Bernard Courtois
Name Origin: From the Greek word iôdes (violet)
Uses: required in humans
Obtained From: sodium and potassium compounds