Xenon tetrafluoride

Xenon tetrafluoride
Names
	IUPAC name Xenon tetrafluoride
Identifiers
CAS Number	13709-61-0 ;
3D model (JSmol)	Interactive image;
ChemSpider	109927 ;
ECHA InfoCard	100.033.858
PubChem CID	123324;
UNII	O825AI8P4W ;
CompTox Dashboard (EPA)	DTXSID50160062 ;
	InChI InChI=1S/F4Xe/c1-5(2,3)4 Key: RPSSQXXJRBEGEE-UHFFFAOYSA-N ; InChI=1/F4Xe/c1-5(2,3)4 Key: RPSSQXXJRBEGEE-UHFFFAOYAW;
	SMILES F[Xe](F)(F)F;
Properties
Chemical formula	XeF; 4
Molar mass	207.2836 g mol−1
Appearance	White solid
Density	4.040 g cm−3, solid
Melting point	117 °C (243 °F; 390 K) sublimes
Solubility in water	Reacts
Structure
Coordination geometry	D4h
Molecular shape	square planar
Dipole moment	0 D
Thermochemistry
Std molar; entropy (S⦵298)	146 J·mol−1·K−1
Std enthalpy of; formation (ΔfH⦵298)	−251 kJ·mol−1
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Xenon tetrafluoride is a chemical compound with chemical formula XeF
₄. It was the first discovered binary compound of a noble gas. It is produced by the chemical reaction of xenon with fluorine:

Xe + 2 F
₂ → XeF
₄

This reaction is exothermic, releasing an energy of 251 kJ/mol.

Xenon tetrafluoride is a colorless crystalline solid that sublimes at 117 °C. Its structure was determined by both NMR spectroscopy and X-ray crystallography in 1963. The structure is square planar, as has been confirmed by neutron diffraction studies. According to VSEPR theory, in addition to four fluoride ligands, the xenon center has two lone pairs of electrons. These lone pairs are mutually trans.

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