Samarium at Chemical Elements.com 

 

Basic Information


Name: Samarium
Symbol: Sm
Atomic Number: 62
Atomic Mass: 150.36 amu
Melting Point: 1072.0 °C (1345.15 °K, 1961.6 °F)
Boiling Point: 1900.0 °C (2173.15 °K, 3452.0 °F)
Number of Protons/Electrons: 62
Number of Neutrons: 88
Classification: Rare Earth
Crystal Structure: Rhombohedral
Density @ 293 K: 7.54 g/cm3
Color: silver


Atomic Structure

[Bohr Model of Samarium]  
Number of Energy Levels: 6

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 24
    Fifth Energy Level: 8
    Sixth Energy Level: 2

Isotopes

Isotope Half Life
Sm-144 Stable
Sm-145 340.0 days
Sm-146 1.03E8 years
Sm-147 1.06E11 years
Sm-148 7.0E15 years
Sm-149 Stable
Sm-150 Stable
Sm-151 90.0 years
Sm-152 Stable
Sm-153 1.92 days
Sm-154 Stable

Facts


Date of Discovery: 1879
Discoverer: Paul Emile Lecoq de Boisbaudran
Name Origin: smarskite (mineral)
Uses: used in magnets, in alloys with cobalt, and nuclear reactors
Obtained From: found with other rare earths