SATHEE: Classification of Elements and Periodicity in Properties

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) $N a^{+} > F^{-} > O^{2 -}$

(d) $A l^{3 +} > M g^{2 +} > N^{3 -}$

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Solution:

(N) All answers are incorrect.

$H^{-} > H > H^{+}; O^{2 -} > F^{-} < N a^{+}$

$O^{2 -} > F^{-} > N a^{+}; N^{3 -} > M g^{2 +} > A l^{3 +}$

For isoelectronic species the size is determined by $Z_{effe}$ . Higher the $Z_{effe}$ . lower is the size of the ions/species.

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Classification of Elements and Periodicity in Properties - Result Question 14

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