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Chemistry Question on Structure of atom

Which one of the following sets of ions represents a collection of isoelectronic species ?

A

K+, Cl−,Ca2+ SC3+K^+,\, Cl^-, Ca^{2+} \,SC^{3+}

B

Ba2+ ,Sr2+ ,K+, S2+Ba^{2+} \, , Sr^{2+} \, , K^+,\, S^{2+}

C

N3−, O2−, F−, S2−N^{3-},\, O^{2-},\, F^-,\, S^{2-}

D

Li+, Na+, Mg2+, Ca2+Li^+,\, Na^+,\, Mg^{2+},\, Ca^{2+}

Answer

K+, Cl−,Ca2+ SC3+K^+,\, Cl^-, Ca^{2+} \,SC^{3+}

Explanation

Solution

isoelectronic means having same no. of electons. K+, Cl−,Ca2+ SC3+K^+,\, Cl^-, Ca^{2+} \,SC^{3+} (all are having 18 electrons).