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Question:

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

1.058˚A

3.023˚A

2.068˚A

4.458˚A

Solution:

Radius of the nth orbit, rn = 0.529n2/Z Å
For He+ ion, Z = 2
Radius of 2nd orbit, r2 = 0.529(22)/2
⟹r2 = 1.058 Å