![[ATOM]](atom.gif) |
Cobalt
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Information valid for Co-59 unless otherwise noted
Basic Information
Symbol: Co
Atomic Number: 27
Mass: 58.9332
Melting Point: 1495.0 C
Boiling Point: 2870.0 C
Number of Protons/Electrons: 27
Number of Neutrons: 32
Classification: Transition Metal
Crystal Structure: Hexagonal
Density @ 293 K: 8.9 g/cm3
Color: silver
Atomic Structure
![[Bohr Model of Cobalt]](b0027.gif) |
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Number of Energy Levels: 4
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 15
Fourth Energy Level: 2
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Isotopes
| Isotope |
Half Life |
| Co-56 |
77.3 days |
| Co-57 |
271.8 days |
| Co-58 |
70.9 days |
| Co-58m |
9.1 hours |
| Co-59 |
Stable |
| Co-60 |
5.3 years |
| Co-60m |
10.5 minutes |
| Co-61 |
1.7 hours |
Facts
Date of Discovery: 1737
Discoverer: George Brandt
Name Origin: From the German word kobalt or kobold (evil
spirit)
Uses: magnets, ceramics, special glasses
Obtained From: arsenic, oxygen, sulfur, cobaltine