54Xe131.294
Noble Gasp-block
Xenon
Element 54 on the periodic table, symbol Xe, group 18, period 5.
Xenon is a chemical element with symbol Xe and atomic number 54. It is a colorless, dense, odorless noble gas, that occurs in the Earth's atmosphere in trace amounts. Although generally unreactive, xenon can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be synthesized.
Appearance: colorless gas, exhibiting a blue glow when placed in a high voltage electric field
Properties
- Atomic Number
- 54
- Atomic Mass
- 131.2936 u
- Group
- 18
- Period
- 5
- Block
- p-block
- Category
- Noble Gas
- State at 25 °C
- Gas
- Melting Point
- 161.4 K · -111.7 °C
- Boiling Point
- 165.1 K · -108.1 °C
- Density
- 5.894 g/L
- Atomic Radius
- 108 pm
- Electronegativity
- 2.6
- Oxidation States
- 0, +2, +4, +6
- Abundance in Crust
- 3.00e-5 mg/kg
- Discovered
- 1898
- Discovered By
- William Ramsay
Electron Configuration
[Kr] 4d10 5s2 5p6
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6
Ionisation Energies (kJ/mol)
- 1. 1,170.4
- 2. 2,046.4
- 3. 3,099.4
Elements near Xenon
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.