Classification Of Elements And Periodicity In Properties Ques 6
Question: The radii of $ F,{{F}^{-}},O $ and $ {{O}^{-2}} $ are in the order of [AIIMS 1999; CPMT 1999]
Options:
A) $ {{O}^{2-}}>{{F}^{-}}>O>F $
B) $ {{O}^{2-}}>{{F}^{-}}>F>O $
C) $ {{F}^{-}}>{{O}^{2-}}>F>O $
D) $ {{O}^{2-}}>O>{{F}^{-}}>F $
Show Answer
Answer:
Correct Answer: A
Solution:
Atomic radius decreases on going from left to right in a period. Thus size of $ O>F $ . As $ {{O}^{2-}} $ and $ {{F}^{-}} $ are isoelectronic, therefore, size of $ {{O}^{2-}}>{{F}^{-}}. $
