Test Academy | From the following pairs of ions which one is not an iso-electronic pair ? O²⁻, F⁻, Na⁺, Mg²⁺, Mn²⁺, Fe³⁺, Fe²⁺, Mn²⁺

Question

From the following pairs of ions which one is not an iso-electronic pair ?

Options :

O²⁻, F⁻
Na⁺, Mg²⁺
Mn²⁺, Fe³⁺
Fe²⁺, Mn²⁺

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