BITSAT 2024 Shift 1 Paper

N3−,O2− and F−are isoelectronics ( 10 electrons) species. Their ionic radii will decrease with increase in magnitude of the nuclear charge from N(Z=7) to 0(Z=8) and F(Z=9).
i.e.
N3−>O2−>F−
1.71Å‌1.40Å
1.71Å‌1.36Å
Hence, option (a) is correct.