Question

Which has smaller size out of o- and o2- and why??

Answer 1

Answer:

O- is the answer of this question

Explanation:

When O accept one electron it become O-. It need only less energy for nucleus than O2-

Answer 2

$O^-$ is smaller as there is more attraction between the electrons and protons.

Explanation:

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

Oxygen is an element with atomic number of 8 and thus has 8 electrons and 8 protons.

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

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

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

Thus $O^-$ has 9 electrons and $O^{2-}$ has 10 electrons.

The attraction of 9 electrons is more by 8 protons and thus is shorter in size.

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