Question

which of the following are isoelectronic species ?
Na+,K+,Fe3+,Fe2+,Al3+,Ca2+,S2-,Cl-,K+​

Answer 1

Answer:

$333 = 03 \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \times \frac{?}{?} \times \frac{?}{?}$

Answer 2

Answer:

333=03 is your right answer