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Question

What would be the radius of second orbit of He+ ion?

A
1.058˚A
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B
3.023˚A
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C
2.068˚A
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D
4.458˚A
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Solution

The correct option is A 1.058˚A
Radius of the nth orbit, rn=0.529n2Z Ao
For He+ ion, Z=2
Radius of 2nd orbit, r2=0.529222
r2=1.058 ˚A

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