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Xenon tetrafluoride
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<p>Xenon tetrafluoride is a <a href="/facts/Chemical_compound/37FXqqtv">chemical compound</a> with <a href="/facts/Chemical_formula/hghUtthl">chemical formula</a> XeF4. It was the first discovered <a href="/facts/Binary_compound/pQ7zq0Cv">binary compound</a> of a <a href="/facts/Noble_gas/j0yHMEAE">noble gas</a>. It is produced by the <a href="/facts/Chemical_reaction/GpqWlKrz">chemical reaction</a> of <a href="/facts/Xenon/9E3XR69R">xenon</a> with <a href="/facts/Fluorine/YUV0Fb8m">fluorine</a>: </p> Xe + 2 F2 → XeF4 <p>This reaction is <a href="/facts/Exothermic/gCuSvpa4">exothermic</a>, releasing an <a href="/facts/Energy/wd8PrQM7">energy</a> of 251 <a href="/facts/Kilojoule/9ndq9jD2">kJ</a>/mol. </p><p>Xenon tetrafluoride is a colorless <a href="/facts/Crystal/e2R2mk3E">crystalline</a> solid that <a href="/facts/Sublimation_(phase_transition)/KDoKokMn">sublimes</a> at 117 °C. Its structure was determined by both <a href="/facts/Nuclear_magnetic_resonance_spectroscopy/SFKgdthI">NMR spectroscopy</a> and <a href="/facts/X-ray_crystallography/WtI0F5DN">X-ray crystallography</a> in 1963. The structure is <a href="/facts/Square_planar/2mLqCvd0">square planar</a>, as has been confirmed by <a href="/facts/Neutron_diffraction/fYXAunDW">neutron diffraction</a> studies. According to <a href="/facts/VSEPR_theory/WqsRgVRV">VSEPR theory</a>, in addition to four fluoride ligands, the xenon center has two lone pairs of electrons. These lone pairs are mutually <a href="/facts/Descriptor_(chemistry)/cPz4wDpX"><i>trans</i></a>. </p>