Question

Which one of the following sets 2/2
of ions represents a collection of
isoelectronic species?
O Na+, Mg2+
O
Zn2+, Ca2+
Cl-, Br-
All of the above​

Answer 1

Answer:

zn2+ ca2+

cl-,Br-

because it has same number of valence cell electron.

but I am not sure about the ONa2+,Mg2+