Question

If the radius of second electron orbit in hydrogen atom be r then the radius of the third orbit will be ______.

Options

• 3r

• 2.25 r

• 9r

• `"r"/3`

Answer 1

If the radius of the second electron orbit in hydrogen atom be r then the radius of the third orbit will be 2.25 r.

Explanation:

Radius of third orbit of hydrogen atom r₃ = `("r" xx 9)/4` = 2.25 r