36Kr83.798
Noble Gasp-block
Krypton
Element 36 on the periodic table, symbol Kr, group 18, period 4.
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.
Appearance: colorless gas, exhibiting a whitish glow in a high electric field
Properties
- Atomic Number
- 36
- Atomic Mass
- 83.7982 u
- Group
- 18
- Period
- 4
- Block
- p-block
- Category
- Noble Gas
- State at 25 °C
- Gas
- Melting Point
- 115.8 K · -157.4 °C
- Boiling Point
- 119.9 K · -153.2 °C
- Density
- 3.749 g/L
- Atomic Radius
- 88 pm
- Electronegativity
- 3
- Oxidation States
- 0, +2
- Abundance in Crust
- 1.00e-4 mg/kg
- Discovered
- 1898
- Discovered By
- William Ramsay
Electron Configuration
[Ar] 3d10 4s2 4p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6
Ionisation Energies (kJ/mol)
- 1. 1,350.8
- 2. 2,350.4
- 3. 3,565
- 4. 5,070
- 5. 6,240
- 6. 7,570
- 7. 10,710
- 8. 12,138
Elements near Krypton
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.