Periodic Classification and Periodic Properties 2 Question 18
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18. Which one of the following is the smallest in size?
======= ####18. Which one of the following is the smallest in size?
3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed (a) $\mathrm{N}^{3-}$
(b) $\mathrm{O}^{2-}$
(c) $\mathrm{F}^{-}$
(d) $\mathrm{Na}^{+}$
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Answer:
Correct Answer: 18. (a)
Solution:
- Among isoelectronic species, the relation in size is
$$ \text { cation }<\text { neutral }<\text { anion } $$
Hence, $\mathrm{Na}^{+}$has smallest size.
