Chemical element · Atomic number 36
Krypton
Krypton in the periodic table: atomic number 36, electron configuration, atomic mass, physical data, oxidation states, media credit and visible sources.
Noble gas
gaseous
83.80 u
A locally stored, license-verified sample photograph has not been curated yet.
Atomic classification
Shell occupancy
Krypton in the Bohr shell model
This shows the electron distribution of the neutral atom in a simplified shell model.
- K · n=1
- 2 electrons
- L · n=2
- 8 electrons
- M · n=3
- 18 electrons
- N · n=4
- 8 electrons
- Electron configuration
- [Ar]4s2 3d10 4p6
- Electrons per shell
- 2 · 8 · 18 · 8
- Group
- 18
- Period
- 4
- Block
- P
- Element category
- Noble gas
Go from looking up chemistry to remembering it.
Turn your notes into source-backed study cards and review them at the right time.
Starter stays free · no payment details
Physical and chemical properties
- Atomic mass
- 83.80 u
- Standard state
- gaseous
- Density
- 0.003733 g/cm³
- Melting point
- 115.79 K
- Boiling point
- 119.93 K
- Electronegativity
- 3 (Pauling)
- First ionisation energy
- 14 eV
- Oxidation states
- 0
- Discovery
- 1898
Safety and periodic classification
Safety
Safe handling cannot be inferred from Krypton's position in the periodic table alone. Laboratory, classroom and disposal decisions must follow the documentation for the exact material and its safety data sheet.
Position and comparison
Krypton is in period 4, group 18 and the P block. Its direct neighbours by atomic number are Bromine and Rubidium. The recorded Pauling electronegativity is 3. Periodic trends are compared only through the separately sourced neighbouring values.
Sources and scope
PubChem attributes element data to sources including IUPAC, NIST and IAEA. Quanta stores the referenced snapshot locally and leaves unknown values unavailable.