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z/e ratio for N*-3 ,O*-2,F*-1 which is isoelectronic species will be
The atomic no. of Nitrogen is 7. Hence its Z is 7. The Anion N^-3 has the total charge 10 including the added three electrons Hence its Z/e ratio ans. is 0.7.Same for O^-2 the ans is 0.8.That for F^-1 is 0.9.Hope it helps.
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