1.

Give reasons : (i)Xenon does not form fluorides such as XeF_(3) and XeF_(5).(ii)Out of noble gases, only xenon is known to form established chemicals compounds.

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Answer :(i)All the FILLED orbitals of XE have paired ELECTRONS.The promotions of one, two or THREE electrons from the 5p-filled orbitals to the 5 d-vacant orbitals will give rise to two, four and six half-filled orbitals respectively.So Xe can combine with even but not odd number of F atoms.Hence, it cannot FORM `XeF_(3)` and `XeF_(5)`.
(ii)Except radon which is radioactive, Xe has least ionization enthalpy among noble gases and hence it readily forms chemical compounds particularly with `O_(2)` and `F_(2)`.


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