Krypton (Kr) — Element 36: Properties & Data | Aladdin Scientific
Krypton(Kr) — Element 36
Krypton (Kr) is a noble gas with atomic number 36 and atomic mass 83.8. It has melting point 115.79 K (-157 °C), boiling point 119.93 K (-153 °C), density 0.003733 g/cm³. It sits in group 18 and period 4 of the periodic table and was discovered in 1898.
Key facts
| Atomic mass | 83.8000 u |
|---|---|
| Electron configuration | [Ar]4s2 3d10 4p6 |
| Electronegativity (Pauling) | 3 |
| Atomic radius (van der Waals) | 202 pm |
| Ionization energy | 14 eV |
| Melting point | 115.79 K |
| Boiling point | 119.93 K |
| Density | 0.003733 g/cm³ |
| Standard state | Gas |
| Year discovered | 1898 |
Frequently asked questions
What is the electron configuration of krypton?
The ground-state electron configuration of krypton is [Ar]4s2 3d10 4p6.
What group and period is krypton in?
Krypton (Kr) is in group 18 and period 4 of the periodic table, classified as a noble gas.
What is the melting point of krypton?
Krypton melts at 115.79 K (-157 °C).
What is the standard state of krypton?
Krypton is a gas at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .