Chemical Elements.com - Plutonium (Pu)

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Basic Information

Name: Plutonium
Symbol: Pu
Atomic Number: 94
Atomic Mass: (244.0) amu
Melting Point: 639.5 °C (912.65 K, 1183.1 °F)
Boiling Point: 3235.0 °C (3508.15 K, 5855.0 °F)
Number of Protons/Electrons: 94
Number of Neutrons: 150
Classification: Rare Earth
Crystal Structure: Monoclinic
Density @ 293 K: 19.84 g/cm³
Color: Unknown

Atomic Structure

Number of Energy Levels: 7

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

Sixth Energy Level:

Seventh Energy Level:

Isotopes

Isotope	Half Life
Pu-236	2.87 years
Pu-237	45.2 days
Pu-238	87.7 years
Pu-239	24100.0 years
Pu-240	6560.0 years
Pu-241	14.4 years
Pu-242	375000.0 years
Pu-243	4.95 hours
Pu-244	8.0E7 years
Pu-245	10.5 hours
Pu-246	10.85 days

Facts

Date of Discovery: 1940
Discoverer: G.T. Seaborg
Name Origin: After the planet Pluto
Uses: bombs, nuclear reactors
Obtained From: some uranium ores, man-made

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