Uranium at Chemical Elements.com 

 

Basic Information


Name: Uranium
Symbol: U
Atomic Number: 92
Atomic Mass: 238.0289 amu
Melting Point: 1132.0 °C (1405.15 °K, 2069.6 °F)
Boiling Point: 3818.0 °C (4091.15 °K, 6904.4 °F)
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

    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

Isotopes

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

Facts


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