KVPY SA Exam 2014 Question Paper

Question : 36 of 80

Marks: +1, -0

If the radius of the hydrogen atom is 53 pm, the radius of the He

^{+}

ion is closest to

Solution:

r_{He^{⊕} }= r_H×n^2/Z

r_{He^{+} }=53×1/2=26.5

pm It is closest to 27 pm.

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