According to Bohr's model, the radius of the second orbit of helium atom is

Options

A. `0.53 Å`
B. `1.06 Å`
C. `2.12 Å`
D. `0.265 Å`

Answer

B

Explanation

`r = (n^(2))/(Z) (r_(0)), rArr r_((n = 2)) = ((2)^(2))/(23) xx 0.53 = 1.06 Å`