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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

Number of Energy Levels: 4

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

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

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