36Kr83.80
Krypton
Noble Gas
Gas at STP
Period 4Group 18Block PDiscovered 1898
[Ar]4s2 3d10 4p6
Krypton (from Greek:κρυπτός kryptos "the hidden one") is a chemical element with symbol Kr and atomic number 36. It is a member of group 18 (noble gases) elements. A colorless, odorless, tasteless noble gas, krypton occurs in trace amounts in the atmosphere, is isolated by fractionally distilling liquefied air, and is often used with other rare gases in fluorescent lamps.
📖 Read more on Wikipedia →Emission Spectrum
Atomic Properties
| Atomic Number | 36 |
| Atomic Mass | 83.80 u |
| Electron Configuration | [Ar]4s2 3d10 4p6 |
| Oxidation States | 0 |
| Electronegativity | 3 (Pauling) |
| Atomic Radius | 202 pm |
| Ionization Energy | 14 eV |
| Block | P |
Physical Properties
| Appearance | colorless gas, exhibiting a whitish glow in a high electric field |
| Standard State | Gas |
| Melting Point | 115.79 K (-157.4 °C) |
| Boiling Point | 119.93 K (-153.2 °C) |
| Density | 0.003733 g/L |
| CPK Color | #5CB8D1 |
Classification
| Category | Noble Gas |
| Group Block | Noble gas |
| Period | 4 |
| Group | 18 |
| Block | P |
Discovery
| Year Discovered | 1898 |
| Discovered By | William Ramsay |
| Electron Shells | 2, 8, 18, 8 |