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Suggest reason why only known binary com...

Suggest reason why only known binary compounds of noble gases are fluorides and oxides of Xenon and to a lesse extent of Kryton.

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F and O are most electronegative elements Kr and Xe both have low ionization enthalpies as compared to He and Ne.
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Noble Gases || Hydrolysis of Xenon Fluorides || Properties of Xenon Fluorides

The noble gases have closed-shell electronic configuration and are monoatomic gases under normal conditions. The low boiling points of the lighter noble gases are due to weak dispersion forces between the atoms and the absence of other Interatomic Interactions. The direct reaction of xenon with fluorine leads to a series of compounds with oxidation numbers +2,+4 and +6. XeF_4 reacts violently with water to give XeO_3 The compound of xenon exhibit rich stereochemistry and their geometries can be deduced considering the total number of electron pairs in the valence shell. Argon is used In arc welding because of its: