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Cobalt at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Cobalt
Symbol: Co
Atomic Number: 27
Atomic Mass: 58.9332 amu
Melting Point: 1495.0 °C (1768.15 K, 2723.0 °F)
Boiling Point: 2870.0 °C (3143.15 K, 5198.0 °F)
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]  
Number of Energy Levels: 4

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 15
    Fourth Energy Level: 2


Isotope Half Life
Co-5677.3 days
Co-57271.8 days
Co-5870.9 days
Co-58m9.1 hours
Co-605.3 years
Co-60m10.5 minutes
Co-611.7 hours


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

Related Links

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MLA Format for Citing This Page

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