![[ATOM]](atom.gif) |
Radium
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Information valid for Ra-266 unless otherwise noted
Basic Information
Symbol: Ra
Atomic Number: 88
Mass: (226.0)
Melting Point: 700.0 C
Boiling Point: 1737.0 C
Number of Protons/Electrons: 88
Number of Neutrons: 138
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 5.0 g/cm3
Color: silverish
Atomic Structure
![[Bohr Model of Radium]](b0088.gif) |
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Number of Energy Levels: 7
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 32
Fifth Energy Level: 18
Sixth Energy Level: 8
Seventh Energy Level: 2
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Isotopes
| Isotope |
Half Life |
| Ra-222 |
38.0 seconds |
| Ra-223 |
11.43 days |
| Ra-224 |
3.66 days |
| Ra-225 |
14.9 days |
| Ra-226 |
1600.0 years |
| Ra-228 |
5.76 years |
Facts
Date of Discovery: 1898
Discoverer: Pierre and Marie Curie
Name Origin: From the Latin word radius (ray)
Uses: treating cancer
Obtained From: uranium ores