![[ATOM]](atom.gif) |
Rubidium
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Information valid for Rb-85 unless otherwise noted
Basic Information
Symbol: Rb
Atomic Number: 37
Mass: 85.4678
Melting Point: 38.89 C
Boiling Point: 688.0 C
Number of Protons/Electrons: 37
Number of Neutrons: 48
Classification: Alkali Metal
Crystal Structure: Cubic
Density @ 293 K: 1.532 g/cm3
Color: silver
Atomic Structure
![[Bohr Model of Rubidium]](b0037.gif) |
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Number of Energy Levels: 5
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 8
Fifth Energy Level: 1
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Isotopes
| Isotope |
Half Life |
| Rb-81 |
4.57 hours |
| Rb-82 |
2.25 minutes |
| Rb-83 |
86.2 days |
| Rb-84 |
32.9 days |
| Rb-85 |
Stable |
| Rb-86 |
18.65 days |
| Rb-87 |
4.8E10 years |
| Rb-88 |
17.7 minutes |
| Rb-89 |
15.44 minutes |
| Rb-90 |
2.6 minutes |
| Rb-90m |
4.3 minutes |
Facts
Date of Discovery: 1861
Discoverer: R. Bunsen
Name Origin: From the Latin word rubidus (red)
Uses: catalyst, photocells
Obtained From: lithium production