Question

Among the following, the iso electronic species are a) O.F b) Mgt?, Ne c) O-2, Ar d) Na+, CI​

Answer 1

Answer:

Na⇒1s 2 ,2s 2 2p 6,3s 1Na

+⇒1s 2,2s 2 2p 6similarly for Mg 2+ ⇒1s 2 ,2s 22p 6Na + ,Mg 2+ , are isoelectronic species. They contain 10 electrons each.

S 2− ⇒1s 2 ,2s 2 2p 6 ,3s 2 3p 6Ar⇒1s 2,2s 2 2p 6 ,3s 2 3p 6K + ⇒1s 2 ,2s 2 2p 6 ,3s 2 3p 6Ca 2+⇒1s 2 ,2s 2 2p 6,3s 2 3p 6Ar,S 2− ,Ca 2+andK + are isoelectronic species. They contain 18 electrons each.

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