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Information valid for Cm-247 unless otherwise noted

Basic Information

Symbol: Cm
Atomic Number: 96
Mass: (247.0)
Melting Point: 1340.0 C
Boiling Point: Unknown
Number of Protons/Electrons: 96
Number of Neutrons: 151
Classification: Rare Earth
Crystal Structure: Unknown
Density @ 293 K: 13.511 g/cm3
Color: Unknown

Atomic Structure

[Bohr Model of Curium]
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: 25
    Sixth Energy Level: 9
    Seventh Energy Level: 2


Isotope Half Life
Cm-241 32.8 days
Cm-242 162.8 days
Cm-243 29.1 years
Cm-244 18.1 years
Cm-245 8500.0 years
Cm-246 4760.0 years
Cm-247 1.56E7 years
Cm-248 348000.0 years
Cm-249 1.1 hours
Cm-250 9700.0 years


Date of Discovery: 1944
Discoverer: G.T. Seaborg
Name Origin: After Pierre and Marie Curie
Uses: No uses known
Obtained From: Man-made