Periodic Classification and Periodic Properties - Result Question 21
####18. Which one of the following is the smallest in size?
(a) $N^{3-}$
(b) $O^{2-}$
(c) $F^{-}$
(d) $Na^{+}$
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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, $Na^{+}$has smallest size.
