Xenon tetroxide
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Xenon tetroxide (molecular formula XeO4) is a yellow crystalline solid that is stable below -35.9°C. Xenon here has an oxidation state of +8 and oxygen of -2. All eight valence shell electrons of xenon are involved, making it an unstable compound. Above -35.9°C, however, it explodes to give xenon and oxygen gas. Oxygen is the only element that can bring xenon up to its highest oxidation state, even fluorine can only give XeF6 (xenon hexafluoride). Xenon tetroxide dissolves in water to give perxenic acid, and in alkalis to give the perxenate ion.