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which has smaller size O- or O2- ? Give reason

O- has smaller size as it has only 9 e. Whereas O2- is larger because it has 10 e.

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O2-
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O- Because as the no. of e- added the will be low attractive force act on it . That's why O- is smaller than O2-...
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O-
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When electrons no..... decreses then the force of attraction from nucleus becomes more effective as compare to before when electrons not looses that"s that why size becomes smaller
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