Classification of Elements and Periodicity in Properties - Result Question 14
####14. Which of the following orders of ionic radii is correctly represented?
[2014]
(a) $H^{-}>H^{+}>H$
(b) $Na^{+}>F^{-}>O^{2-}$
(c) $F^{-}>O^{2-}>Na^{+}$
(d) $Al^{3+}>Mg^{2+}>N^{3-}$
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Solution:
- (N) All answers are incorrect.
$H^{-}>H>H^{+} ; O^{2-}>F^{-}<Na^{+}$
$O^{2-}>F^{-}>Na^{+} ; N^{3-}>Mg^{2+}>Al^{3+}$
For isoelectronic species the size is determined by $Z _{\text{effe }}$. Higher the $Z _{\text{effe}}$. lower is the size of the ions/species.
