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Information valid for U-238 unless otherwise noted

Basic Information

Symbol: U
Atomic Number: 92
Mass: 238.0289
Melting Point: 1132.0 C
Boiling Point: 3818.0 C
Number of Protons/Electrons: 92
Number of Neutrons: 146
Classification: Rare Earth
Crystal Structure: Orthorhombic
Density @ 293 K: 18.95 g/cm3
Color: silverish

Atomic Structure

[Bohr Model of Uranium]
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: 21
    Sixth Energy Level: 9
    Seventh Energy Level: 2


Isotope Half Life
U-230 20.8 days
U-231 4.2 days
U-232 70.0 years
U-233 159000.0 years
U-234 247000.0 years
U-235 7.0004E8 years
U-236 2.34E7 years
U-237 6.75 days
U-238 4.47E9 years
U-239 23.5 minutes
U-240 14.1 hours


Date of Discovery: 1789
Discoverer: Martin Klaproth
Name Origin: After the planet Uranus
Uses: fuel for nuclear reactors
Obtained From: many rocks, large amounts in pitchblende and carnotite

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. Uranium Institute
  2. Chemical Of The Week -- Uranium Clock