Classification Of Elements And Periodicity In Properties Question 137
The correct order of ionic size of $ {{N}^{3-}},{{O}^{2-}},{{F}^{-}},N{{a}^{+}},N{{a}^{+}},M{{g}^{2+}} $ will be
Options:
A) $ {{O}^{2-}}<{{N}^{3-}}<{{F}^{-}}<N{{a}^{+}}<M{{g}^{2+}} $
B) $ M{{g}^{2+}}N{{a}^{+}}<{{F}^{-}}<{{O}^{2-}}<{{N}^{3-}} $
C) $ {{F}^{-}}<{{N}^{3-}}<{{O}^{2-}}<N{{a}^{+}}<M{{g}^{2+}} $
D) $ {{F}^{-}}<M{{g}^{2+}}<{{O}^{2-}}<N{{a}^{+}}<{{N}^{3-}} $
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Answer:
Correct Answer: B
Solution:
Idea This problem can be solved by using the concept of variation of atomic size along period. Which can be solved by using the skill of nuclear charge. All given species are isoelectronic having $ 10{{e}^{\Theta }}s $ but more negative charge on atom higher will be radius and more +ve charge smaller will be radius hence. $ M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}}<{{O}^{2-}}<{{N}^{3-}} $ TEST Edge: Problems relating trend in atomic properties such as ionisation enthalpy, electron gain enthalpy are asked frequently. So, students are advised to study in depth about their meaning, periodic variation and relation between them.
BETA
