Cobalt at Chemical Elements.com 


 

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

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