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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]
Number of Energy Levels: 4

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


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


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