Kr
Krypton
Krypton is a chemical element with the symbol Kr and atomic number 36. It has a standard atomic weight of 83.798, sits in period 4 and group 18, and is classified as a noble gas.
Properties
| Symbol | Kr |
|---|---|
| Atomic number | 36 |
| Standard atomic weight | 83.798 |
| Category | Noble gas |
| Group | 18 |
| Period | 4 |
| Electron configuration | [Ar] 3d10 4s2 4p6 |
| Outer-shell electrons | 8 |
The figure of 83.798 is a standard atomic weight.
Calculate with krypton
- Molar mass of any formula containing it
- Electron configuration, including ions
- Effective nuclear charge by Slater's rules
- Average atomic mass from isotope abundances
Group 18
Atomic weights are the IUPAC 2021 standard values, abridged to the conventional five significant figures. Group, period, category and electron configuration are derived from the atomic number rather than stored, so they cannot drift out of step with it.