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Which of the following are isoelectronic...

Which of the following are isoelectronic species, i.e., those having the same number of electrons:
`Na^(o+), K^(o+), Mg^(2+), Ca^(2+), S^(2-), Ar`

Text Solution

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Isoelectronic species are those which contain same number of electrons
`Na^+ , Mg^(2+)` are isoelectronic (contain 10 electrons)
`K^+, Ca^(2+), S^(2-)` and Ar are isolectronic (contain 18 electrons).
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