Hello Mohan,

I thought that you forgot to type the complete question because you have not given the name of species among which you want to select the species isoelectric with CO. Without complete question we cannot guide you properly.

Generally isoelectric species are those species which have same number of electrons. CO has 14 electrons so you can compare with other species also.

Or you can help us out with the species so that we can assist you properly.

Good Luck!!