Classification Of Elements And Periodicity In Properties Ques 1
Question: The ratio between radii of $ H{{e}^{+}} $ ion and H atom is [MP PET 1996]
Options:
A) $ \frac{1}{2} $
B) 1
C) $ \frac{3}{2} $
D) 2
Show Answer
Answer:
Correct Answer: B
Solution:
Value of Z for hydrogen =1 Value of Z for helium = 2 Value of n for both is = 1 $ r_{H}=\frac{0.52\times 1^{2}}{1} $
$ {r_{H{{e}^{+}}}}=\frac{0.52\times 1^{2}}{1} $
$ \frac{r_{H}}{{r_{H{{e}^{+}}}}}=1:1 $ or $ {r_{H{{e}^{+}}}}:r_{H}=1:1 $
