Symbol	Xe
Atomic number	54
Group	18 (Noble gases)
Period	5
Block	p
Classification	Noble Gas

Appearance	Colorless gas, exhibiting a blue glow when placed in a high voltage electric field
Color	Colorless

Number of protons	54 p+
Number of neutrons	77 n0
Number of electrons	54 e-

From Wikipedia, the free encyclopediaXenon 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.

Phase at STP	Gas
Density	5.894 g/cm3
Atomic weight	131.294 u

Melting point	161.4 K -111.75 °C -169.15 °F
Boiling point	165.051 K -108.099 °C -162.5782 °F
Heat of vaporization	12.64 kJ/mol

Electronegativity (Pauling Scale)	2.6
Electron affinity	-77 kJ/mol
Oxidation states	0, +1, +2, +4, +6, +8 (rarely more than 0; a weakly acidic oxide)
Ionization energies	1170.4 kJ/mol 2046.4 kJ/mol 3099.4 kJ/mol

Electron configuration Shorthand configuration	[Kr] 4d10 5s2 5p6
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6
Electrons per shell	2, 8, 18, 18, 8
Valence electrons	8
Valency electrons	0
Bohr model	Figure: Shell diagram of Xenon (Xe) atom.
Orbital Diagram	1s 2s 2p 3s 3p 3d 4s 4p 4d 5s 5p

Discovery and first isolation	William Ramsay, Morris Travers (1898)
Named by	William Ramsay (1898)
Discovery of xenon Xenon was discovered in England by the Scottish chemist William Ramsay and English chemist Morris Travers in September 1898, shortly after their discovery of the elements krypton and neon. They found xenon in the residue left over from evaporating components of liquid air. Ramsay suggested the name xenon for this gas from the Greek word ξένον xénon, neuter singular form of ξένος xénos, meaning 'foreign(er)', 'strange(r)', or 'guest'.

CAS Number	7440-63-3
ChemSpider ID	22427
EC number	231-172-7
PubChem CID Number	23991