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N^(3-),O^(2-),F^-,Na^+, Mg^(2+),Al^(3+) ...

`N^(3-),O^(2-),F^-,Na^+, Mg^(2+),Al^(3+)` what is comman in them ?

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They are isoelectronic (10 electrons).
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A N EXCEL PUBLICATION-CLASSIFICATION TO ELEMENTS AND PERIODICITY IN PROPERTIES-QUESTION BANK
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