Why XeF₂ and XeF₄ act as fluoride donors whereas XeF₆ acts as fluoride acceptor???

I THINK ANS LIE SOMEWHERE IN CONCEPT OF STABILIZATION

WHEN XeF2 OR XeF4 IS FORMED 2&4 VALENCY ARE ONLY SATISFIED SO FOR STABILIZATION

THE Xe will donate the F molecule to attain stabilization

but for XeF6 DONATING 6 F molecule require more energy than accepting 2 F molec

so here it will accept 2 F ATOMS for stabilization

hope your doubt is cleared

plz rate

BEST OF LUCK

it seems, u r sumwht correct....but there may be sum other reasons also...let's find it out......