Curium at Chemical Elements.com 


 

Basic Information


Name: Curium
Symbol: Cm
Atomic Number: 96
Atomic Mass: (247.0) amu
Melting Point: 1340.0 °C (1613.15 °K, 2444.0 °F)
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

    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

Isotopes

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

Facts


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