Kr
Krypton Symbol (Kr)
Krypton is element 36 of the periodic table. Copy its symbol Kr and see its atomic weight, electron configuration and physical properties.
What does Kr mean?
Kr is the chemical symbol for krypton, element number 36 in the periodic table. Krypton is a noble gas in group 18, period 4. It is a noble gas used in some high-performance lighting and lasers.
Codes and properties
| Chemical symbol | Kr |
|---|---|
| Atomic number (Z) | 36 |
| Atomic weight (PubChem) | 83.80 |
| Group / period | 18 / 4 |
| Element category | noble gas |
| Electron configuration | [Ar]4s² 3d¹⁰ 4p⁶ |
| State at 20 °C | Gas |
| Oxidation states | 0 |
| Electronegativity (Pauling) | 3 |
| Melting point | 115.79 K (-157.36 °C) |
| Boiling point | 119.93 K (-153.22 °C) |
| Density | 0.003733 g/cm³ |
| Discovered | 1898 |
How to type Kr
- Plain text: type
Kr— element symbols are ordinary Latin letters, with the first letter capitalised and the second lowercase. - Subscripts in formulas: use Unicode subscript digits (₀₁₂₃₄₅₆₇₈₉) for formulas such as H₂O — copy them from the chemistry keyboard.
- LaTeX: write
\mathrm{Kr}in math mode, or use the mhchem package:\ce{Kr}. - HTML:
Kr; for subscripts use<sub>, e.g.H<sub>2</sub>O.
Frequently asked questions
What is the chemical symbol for krypton?
The chemical symbol for krypton is Kr.
What is the atomic number of krypton?
Krypton has atomic number 36, meaning each atom has 36 protons.
What is the electron configuration of krypton?
The ground-state electron configuration of krypton is [Ar]4s² 3d¹⁰ 4p⁶.
Related symbols
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Reference: Krypton on PubChem (NIH)