Question

Out of O, O- and O2- which one has smallest radius and why?????

Answer 1

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ORDER OF THERE SIZE ARE :-

O2- > O- > O

AS FOR ANIONS...

NEGATIVE CHARGE IS DIRECTLY PROPORTIONAL TO SIZE.


HOPE IT WILL HELP YOU

Answer 2

$O$ has the smallest radius because the attraction between the last electron and nucleus decreases.

Explanation:

Atomic radius of an atom is defined as the total distance from the nucleus to the valence shell of the atom.

When more electrons are added in the same shell and nuclear charge remains same, the attraction between the last electron and nucleus decreases, which results in the increase in atomic size.

Thus, atomic radii tend to decrease when electrons are added to the same element.

$O:8:1s^22s^22p^4$

$O^-:9:1s^22s^22p^5$

$O^{2-}:10:1s^22s^22p^6$

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