Atomic number 36
Krypton
Noble gas
In the real world
Quick facts
- Atomic mass
- 83.798
- Group
- 18
- Period
- 4
- State (STP)
- gas
- Electronegativity
- –
- Common ox. states
- 0, +2
Properties
Electron configuration
[Ar] 3d¹⁰ 4s² 4p⁶
- Ionization energy
- 1350.8 kJ/mol
- Electron affinity
- -96.0 kJ/mol
- Melting point
- 115.78 K (-157.4 °C)
- Boiling point
- 119.93 K (-153.2 °C)
How dangerous is it?
1/5 · Low risk
A colorless, non-toxic noble gas that does not react or burn. Its only caution is that, like any gas, it can crowd out air in a sealed room.
- AsphyxiantImmediate
In a sealed space krypton can displace air and leave too little oxygen to breathe. (only a risk in a confined, unventilated space)
It is used with ventilation so oxygen is never crowded out; in open air it is harmless.
How it bonds
Krypton's outer shell is full, but unlike helium and neon it can be coaxed (under harsh conditions) into a single known compound, KrF₂. For all high-school purposes: krypton doesn't bond.
