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Which one of the following is isoelectronic with Ne?
(a) N3- (b) Mg2+ (c) Al3+ (d)all of the above

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Isoelectronic means having same no of electrons Since Ne has 10 electrons and N3- ,Mg2+ ,Al3+ All are having 10 electrons thus all are isoelectronic to Ne atom So d option is correct
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Isoelectronic means same number of electrons so all have 10 electrons ,so option D will be the required answer
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All the above because all ions having 10 electrons which is equal to neon
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