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Consider the following species. N^(3-) ...

Consider the following species.
`N^(3-) , O^(2-) , Na^+ , Mg^(+2) , Al^(+3)`.
What is common to them?

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They are isoelectronic species.
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PATHFINDER-PERIODIC CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES-QUESTION BANK
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  9. Arrange the following in order of increasing radii. F, Cl, Br

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