Question

7. Among the following the group which represents a collection of iso electronic species is [ (atomic number of Cs = 55 and Br = 35)
a) N-3, F-, Na+
b) Be, Al-3, CI
c) Ca+2, Cs+1, Br
d) Na+, Ca+2, Mg+2​

Answer 1

Answer:

the answer is options a

because iso electronic species means same no of electrons

in Na+ no of electrons are 10

in N^-3 no of electrons are 10

in F^-1 no of electrons 10