Question

why some noble gas elements shows violation of octet ru​

Answer 1

Answer:

Free Radicals

Some elements, most notably nitrogen, can form compounds that do not obey the octet rule. ... As the octet rule requires eight electrons around each atom, a molecule with an odd number of electrons must disobey the octet rule. Molecules with unpaired electrons are termed 'free radicals.

Answer 2

It is clear that octet rule is based upon  the chemical inertness of noble gases. However, some noble gases (for example  xenon and krypton) also combine with  oxygen and fluorine to form a number of  compounds like XeF2, KrF2, XeOF2 etc.,it accounts for complete of octet to form compounds but some noble gases form  a number of compounds under vey special lab condition.