Make your own free website on


Information valid for Pu-244 unless otherwise noted

Basic Information

Symbol: Pu
Atomic Number: 94
Mass: (244.0)
Melting Point: 639.5 C
Boiling Point: 3235.0 C
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

[Bohr Model of Plutonium]
Number of Energy Levels: 7

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 32
    Fifth Energy Level: 24
    Sixth Energy Level: 8
    Seventh Energy Level: 2


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


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

Related Links

Note: The external links below are not a part of this site and their content is not the responsibility of this site

  1. A Perspective on the Dangers of Plutonium
  2. What is Plutonium?