No
there are noble gas in nature
that is very stable gas and it has monoatomic structure
the noble gas has monoatomic structure that mean the number of outermost shell electron of its is 8 except Helium gas
but the others gas , eg N2 O2 ,are also element and they need to share electron to each other to from a diatomic structure
since the number of outermost shell electron is not 8 , not stable .