Question
Which one of the following groups represents a collection of isoelectronic species? $$\left( {{\text{At}}{\text{.}}\,{\text{nos}}.:Cs - 55,Br - 35} \right)$$
A.
$$N{a^ + },C{a^{2 + }},M{g^{2 + }}$$
B.
$${N^{3 - }},{F^ - },N{a^ + }$$
C.
$$Be,A{l^{3 + }},C{l^ - }$$
D.
$$C{a^{2 + }},C{s^ + },Br$$
Answer :
$${N^{3 - }},{F^ - },N{a^ + }$$
Solution :
All the three species $${N^{3 - }},{F^ - },N{a^ + }$$ have the same number of electrons (10) hence are called isoelectronic species.