Question

name a species that will be isoelectronic with AR​

Answer 1

An Isoelectronic Series is a group of atoms/ions that have the same number of electrons. Examples. N3-, O2-, F-, Ne, Na+, Mg2+, Al3+ This series each have 10 electrons. P3-, S2-, Cl-, Ar, K+, Ca2+, Sc3+

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Answer 2

Cl-, K+, S2-, Ca2+..... These all are isoelectronic species to argon as argon has 18 electrons and all these also have 18 electrons in their shells