Which anion will have higher the larger radius O-2 or Cl- ion ?

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Explanation: 

Cl- ion electronic configuration is [Ne] 3s2 3p6

O2- ion electronic configuration is [He] 2s2 2p6

in case of Cl- the outermost electrons are in third energy level and due to which its electrons in the outermost shell would be more far away the nucleus and hence its size would be bigger compared to the O2- .

Answer: 

Cl- ion

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