Xenon

54
Xe
Group
18
Period
5
Block
p
Protons
Electrons
Neutrons
54
54
77
General Properties
Atomic Number
54
Atomic Weight
131.293
Mass Number
131
Category
Noble gases
Color
Colorless
Radioactive
No
From the Greek word xenon, stranger
Crystal Structure
Face Centered Cubic
History
Xenon was discovered in England by the Scottish chemist William Ramsay and English chemist Morris Travers in 1898.

They found xenon in the residue left over from evaporating components of liquid air.

Spectroscopic analysis showed the previously unseen beautiful blue lines that indicated the presence of a new element.
Electrons per shell
2, 8, 18, 18, 8
Electron Configuration
[Kr] 4d10 5s2 5p6
Xe
If inhaled, xenon can cause a person's voice to deepen
Physical Properties
Phase
Gas
Density
0.005887 g/cm3
Melting Point
161.45 K | -111.7 °C | -169.06 °F
Boiling Point
165.03 K | -108.12 °C | -162.62 °F
Heat of Fusion
2.3 kJ/mol
Heat of Vaporization
12.64 kJ/mol
Specific Heat Capacity
0.158 J/g·K
Abundance in Earth's crust
2×10-9%
Abundance in Universe
1×10-6%
Vial
Image Credits: Images-of-elements
Vial of glowing ultrapure xenon
CAS Number
7440-63-3
PubChem CID Number
23991
Atomic Properties
Atomic Radius
108 pm
Covalent Radius
140 pm
Electronegativity
2.6 (Pauling scale)
Ionization Potential
12.1298 eV
Atomic Volume
37.3 cm3/mol
Thermal Conductivity
0.0000569 W/cm·K
Oxidation States
2, 4, 6, 8
Applications
Xenon is used in flash lamps and arc lamps, and in photographic flashes.

Xenon is used in medicine as a general anesthetic and in medical imaging.

In nuclear energy applications, xenon is used in bubble chambers, probes, and in other areas where a high molecular weight and inert nature is desirable.
Xenon is not toxic, but its compounds are highly toxic
Isotopes
Stable Isotopes
124Xe, 126Xe, 128Xe, 129Xe, 130Xe, 131Xe, 132Xe, 134Xe, 136Xe
Unstable Isotopes
110Xe, 111Xe, 112Xe, 113Xe, 114Xe, 115Xe, 116Xe, 117Xe, 118Xe, 119Xe, 120Xe, 121Xe, 122Xe, 123Xe, 125Xe, 127Xe, 133Xe, 135Xe, 137Xe, 138Xe, 139Xe, 140Xe, 141Xe, 142Xe, 143Xe, 144Xe, 145Xe, 146Xe, 147Xe