36Kr83.798
Krypton
Noble gas · element 36 · group 18, period 4
Quick facts
| Symbol | Kr |
|---|---|
| Atomic number | 36 |
| Relative atomic mass | 83.798 |
| Category | Noble gas |
| Position | group 18, period 4 |
| State at 20 °C | Gas |
| Melting point | -157.4 °C |
| Boiling point | -153.4 °C |
| Density | 0.004 g/cm³ |
| Electronegativity | 3 |
| Electron configuration | [Ar] 3d10 4s2 4p6 |
About Krypton
Krypton has the symbol Kr and atomic number 36, which means every krypton atom has 36 protons in its nucleus and, in a neutral atom, 36 electrons. At room temperature it is a gas.
Noble gases are in group 0. They have a full outer shell of electrons, so they are very unreactive and exist as single atoms.
It melts at -157.4 °C and boils at -153.4 °C.
Explore it
See where krypton sits, and drag the temperature slider to watch it melt and boil, on the interactive periodic table. Practise with quizzes on OmniEx.