Atoms And Nuclei Question 415

Question: According to Bohr’s model, the radius of the second orbit of helium atom is

Options:

A) 0.53 $ \overset{o}{\mathop{A}}, $

B) 1.06 $ \overset{o}{\mathop{A}}, $

C) 2.12 $ \overset{o}{\mathop{A}}, $

D) 0.265 $ \overset{o}{\mathop{A}}, $

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Answer:

Correct Answer: B

Solution:

$ r=\frac{n^{2}}{Z}(r_{0}) $ ; Þ
$ \Rightarrow {r_{(n=2)}}=\frac{{{(2)}^{2}}}{2}\times 0.53=1.06,\overset{{}^\circ}{\mathop{A}}, $



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