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Question

Among the following, the isoelectronic species is/ are:
(i) O2,F,Na+,Mg2+
(ii) Na+,Mg+,Al3+,F
(iii) N3,O2,F,Ne

A
(i) and (ii)
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B
(i), (ii) and (iii)
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C
(ii) and (iii)
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D
(i) and (iii)
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Solution

The correct option is D (i) and (iii)
Isoelectronic species are those species which have same number of electrons.
Among the options,
O2=10 electrons
F=10 electrons
Na+=10 electrons
Mg2+=10 electrons
And, N3,O2,F and Ne have 10 electrons each.
So, option (i) & (iii) have isoelectronic species.

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