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Question
What do you understand by isoelectronic species? Name a species that will be isoelectronic with the following atom or ion:-
Ar
Solution
Atoms and ions having the same number of electrons are called isoelectronic species.
Ar has 18 electrons. Thus, the species isoelectronic with it will also have 18 electrons. Some of its isoelectronic species are S2– ion (16 + 2 = 18 electrons), Cl– ion (17 + 1 = 18 electrons), K+ ion (19 – 1 = 18 electrons), and Ca2+ ion (20 – 2 = 18 electrons).
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