Chemical Elements.com - Potassium (K)

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Basic Information

Name: Potassium
Symbol: K
Atomic Number: 19
Atomic Mass: 39.0983 amu
Melting Point: 63.65 °C (336.8 K, 146.57 °F)
Boiling Point: 774.0 °C (1047.15 K, 1425.2 °F)
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

Number of Energy Levels: 4

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Isotopes

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

Facts

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)

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