Question

does zero electronic species exist ??give example ​

Answer 1

that means there combining capacity is zero , and so they exist as monatomic molecules such as He, Ne , Ar etc . Hellium atom has the electronic configuration 1s2 . and so , the bond order ( half the difference in the numbers of bonding and antibonding electrons ) for such a diatomic entity is zero

I hope this helps you in solving your problem