Periodic Classification and Periodic Properties 2 Question 14
14. The correct order of radii is
$(2000,1 \mathrm{M})$
(a) $\mathrm{N}<\mathrm{Be}<$ B
(b) $\mathrm{F}^{-}<\mathrm{O}^{2-}<\mathrm{N}^{3-}$
(c) $\mathrm{Na}<\mathrm{Li}<\mathrm{K}$
(d) $\mathrm{Fe}^{3+}<\mathrm{Fe}^{2+}<\mathrm{Fe}^{4+}$
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Answer:
Correct Answer: 14. (b)
Solution:
- Among isoelectronic species, greater the negative charge, greater the ionic size, hence $\mathrm{F}^{-}<\mathrm{O}^{2-}<\mathrm{N}^{3-}$.
