Question

which of the following is isoelectronic a) Fe3+,Co3+ b) Fe3+,Mn2+c) Co3+,Sc3+d) Sc3+,Ti3+

Answer 1

I think option C is correct

Answer 2

Isoelectronic species are the species having same number of electrons present in it.
Here, option (b) is correct.
Fe^3 and Mn^2+ have 23 electrons in both of them.