![[ATOM]](atom.gif) |
Samarium
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Information valid for Sm-150 unless otherwise noted
Basic Information
Symbol: Sm
Atomic Number: 62
Mass: 150.36
Melting Point: 1072.0 C
Boiling Point: 1900.0 C
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]](b0062.gif) |
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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
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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: No uses known
Obtained From: found with other rare earths