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Information valid for K-39 unless otherwise noted

Basic Information

Symbol: K
Atomic Number: 19
Mass: 39.0983
Melting Point: 63.65 C
Boiling Point: 774.0 C
Number of Protons/Electrons: 19
Number of Neutrons: 20
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: 0.862 g/cm3
Color: silvery

Atomic Structure

[Bohr Model of Potassium]
Number of Energy Levels: 4

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


Isotope Half Life
K-39 Stable
K-40 1.28E9 years
K-41 Stable
K-42 12.4 hours
K-43 22.3 hours


Date of Discovery: 1807
Discoverer: Sir Humphrey Davy
Name Origin: potash
Symbol Origin: From the Latin word kalium
Uses: glass, soap
Obtained From: minerals (carnallite)

Related Links

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  1. HHMI Laboratory Safety: Potassium