question_answer 41)

Which of the following are isoelectronic species, i.e., those having the same number of electrons? \[\mathbf{N}{{\mathbf{a}}^{\mathbf{+}}}\mathbf{,M}{{\mathbf{g}}^{\mathbf{2+}}}\mathbf{,}{{\mathbf{K}}^{\mathbf{+}}}\mathbf{,C}{{\mathbf{a}}^{\mathbf{2+}}}\mathbf{,}{{\mathbf{S}}^{\mathbf{2-}}}\mathbf{,Ar}\]

Answer:

(i) \[N{{a}^{+}},M{{g}^{2+}}\] are isoelectronic having 10 electrons. (ii) \[{{K}^{+}},C{{a}^{2+}},{{S}^{2-}},Ar\] are isoelectronic having 18 electrons.