Classification Of Elements And Periodicity In Properties Ques 47
Question: Which one of the following is expected to have largest size [UPSEAT 2004]
Options:
A) $ {{F}^{-}} $
B) $ {{O}^{-2}} $
C) $ A{{l}^{+3}} $
D) $ {{N}^{-3}} $
Show Answer
Answer:
Correct Answer: D
Solution:
Due to having three electrons atomic size increases. $ {{F}^{-}}=9+1=10 $ electrons ; $ {{O}^{-2}}=8+2=10 $ electrons $ Al+3=13-3=10 $ electrons ; $ {{N}^{3-}}=7+3=10,{{e}^{-}}. $ Because electrostatic force between nucleus and $ \bar{e} $ cloud is least in nitrogen.
