The mineralogy of Krypton
| About Krypton |
|---|
| Krypton is a noble gas and as such does not form any natural minerals. |
| General Properties | |
|---|---|
| Symbol: | Kr |
| Atomic Number: | 36 |
| Standard atomic weight (Ar): | 83.798(2) |
| Electron configuration: | [Ar] 3d10 4s2 4p6 |
| Photos | ||
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| < | Vial of glowing ultrapure krypton. | > |
| Atomic Properties | |
|---|---|
| Atomic Radius: | 88 pm |
| Van der Waals Radius: | 202 pm |
| 1st Ionization energy: | 1351 kJ/mol |
| Oxidation States: | 2 |
| Physical Properties | |
|---|---|
| Standard State: | gas |
| Bonding Type: | atomic |
| Melting Point: | 116 K |
| Boiling Point: | 120 K |
| Metal/Non-Metal: | noble gas |
| Main isotopes of Krypton | ||||
|---|---|---|---|---|
| Isotope | % in Nature | Half Life | Decay type | Decay product |
| 78Kr | 0.35% | >1.1×1020y | β+β+ ? | 78Se |
| 79Kr | synthetic | 35.04h | ε | 79Br |
| β+ | 79Br | |||
| 80Kr | 2.25% | stable | ||
| 81Kr | trace | 2.29×105y | ε | 81Br |
| 82Kr | 11.6% | stable | ||
| 83Kr | 11.5% | stable | ||
| 84Kr | 57.0% | stable | ||
| 85Kr | synthetic | 10.756h | β− | 85Rb |
| 86Kr | 17.3% | - | β-β- ? | 86Sr |
| Main ions of Krypton | ||||
|---|---|---|---|---|
| Name | Ion | Example minerals | ||
| krypton(II) | Kr2+ | |||
| Other Information | |
|---|---|
| Year Discovered: | 1898 |
| Discovered By: |  Sir William Ramsay  Morris William Travers William Ramsay and Morris Travers |
| Year Isolated: | 1898 |
| Isolated By: | William Ramsay and Morris Travers |
| Named For: | From Greek: kryptos - "hidden one", because of its colorless, odorless, tasteless, gaseous properties |
| CPK color coding: | #5CB8D1 |
| External Links: | WikipediaWebElementsLos Alamos National LaboratoryTheodore Gray's PeriodicTable.com |