Name: Krypton
Symbol: Kr
Atomic Number: 36
Atomic Mass: 83.8 amu
Melting Point: -157.2 °C (115.950005 °K, -250.95999 °F)
Boiling Point: -153.4 °C (119.75001 °K, -244.12 °F)
Number of Protons/Electrons: 36
Number of Neutrons: 48
Crystal Structure: Cubic
Density @ 293 K: 3.74 g/cm3
Color: colorless gas
Atomic Structure
![[Bohr Model of Krypton]](b0036.gif) |
Number of Energy Levels: 4 First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 18 Fourth Energy Level: 8 |
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: 1898Discoverer: Sir William Ramsey
Name Origin: From the Greek word kryptos (hidden)
Uses: Lighting
Obtained From: production of liquid air
Information provided by: http://www.chemicalelements.com