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  • Which ion has the largest radius?Option: 1 Option:

Which ion has the largest radius?

Option: 1

O^{2-}


Option: 2

F^{-}


Option: 3

Se^{2-}


Option: 4

Rb^{+}


Answers (1)

best_answer

Among the four given ions, Fluoride ion and oxide ion is isoelectronic and Se^{2-} ion and
Rb^{+} ion are isoelectronic. We know that among the isoelectronic species, the size is
more for anions having more negative charge.

Therefore, among Fluoride ion and oxide ion , oxide shall be bigger whereas among Se^{2-} ion and Rb^{+} ion, Se^{2-} ion shall be bigger. Se^{2-} has electronic configuration of [Ar] and oxide ion has electronic configuration of [Ne]. As we move down the group, size increases. Therefore, Se^{2-} ion is largest among the given options.

Posted by

Rakesh

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