Answer:
We know that all the occupied
orbitals in xenon atom are paired. By the promotion of one, two or three electrons
from the filled p-orbitals to the vacant d-orbitals in the valence shell, two,
four or six half filled orbitals are formed. Thus, xenon can combine only with
even number of fluorine atoms and not odd. In other words, it cannot form
compounds like\[Xe{{F}_{3}}\] and \[Xe{{F}_{5}}\].
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