![[ATOM]](atom.gif) |
Krypton
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Information valid for Kr-84 unless otherwise noted
Basic Information
Symbol: Kr
Atomic Number: 36
Mass: 83.8
Melting Point: -157.2 C
Boiling Point: -153.4 C
Number of Protons/Electrons: 36
Number of Neutrons: 48
Classification: Noble Gas
Crystal Structure: Cubic
Density @ 293 K: 3.74 g/cm3
Color: colorless gas
Atomic Structure
![[Bohr Model of Krypton]](b0036.gif) |
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Number of Energy Levels: 4
First Energy Level: 2
Second Energy Level: 8
Third Energy Level: 18
Fourth Energy Level: 8
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Isotopes
| Isotope |
Half Life |
| Kr-78 |
Stable |
| Kr-79 |
1.45 days |
| Kr-80 |
Stable |
| Kr-81 |
210000.0 years |
| Kr-82 |
Stable |
| Kr-83 |
Stable |
| Kr-83m |
1.86 hours |
| Kr-84 |
Stable |
| Kr-85 |
10.73 years |
| Kr-85m |
4.48 hours |
| Kr-86 |
Stable |
| Kr-87 |
1.27 hours |
| Kr-88 |
2.84 hours |
| Kr-89 |
3.15 minutes |
| Kr-90 |
32.3 seconds |
Facts
Date of Discovery: 1898
Discoverer: Sir William Ramsey
Name Origin: From the Greek word kryptos (hidden)
Uses: Lighting
Obtained From: production of liquid air