Which ion is not isoelectronic with \( \mathrm{O}^{2-} \) ? P (1) \...

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Which ion is not isoelectronic with \( \mathrm{O}^{2-} \) ?
P
(1) \( \mathrm{N}^{3-} \)
(2) \( \mathrm{Na}^{+} \)
W
(3) \( \mathrm{F}^{-} \)
(4) \( \mathrm{Ti}^{+} \)
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