Quick answerKrypton (Kr) is a noble gas with atomic number 36 and an atomic mass of 83.798 (2023), in group 18, period 4. It was discovered by William Ramsay and Morris Travers in 1898. It is used for camera flashes and airport runway lights. Its electron configuration is [Ar] 3d10 4s2 4p6.
Krypton is a rare noble gas that fills high-powered camera flashes, airport runway lights, and energy-saving windows.
Key facts
| Symbol | Kr |
|---|---|
| Atomic number | 36 |
| Atomic mass | 83.798 (IUPAC standard atomic weight, 2023) |
| Category | noble gas |
| Group | 18 |
| Period | 4 |
| Block | p-block |
| Electron configuration | [Ar] 3d10 4s2 4p6 |
| Discovered | William Ramsay and Morris Travers, 1898 |
| Uses | camera flashes, airport runway lights, insulating windows, lasers, projection lamps |
Quick quiz
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Keep exploring
- Periodic table — all 118 elements
- Helium (He) — another noble gas, atomic number 2
- Neon (Ne) — another noble gas, atomic number 10
- Argon (Ar) — another noble gas, atomic number 18
- Xenon (Xe) — another noble gas, atomic number 54
- Radon (Rn) — another noble gas, atomic number 86
- Oganesson (Og) — another noble gas, atomic number 118
Sources & last updated
- CIAAW — Standard Atomic Weights
- PubChem Periodic Table
- Wikipedia — Timeline of chemical element discoveries
Last updated: . Figures are shown with their year; where sources disagree, the value is left out rather than estimated.