Question

The Bohr orbit radius for the hydrogen atom (n = 1) is approximately 0.530Å. The radius for the first excited state (n = 2) orbit is (in Å)

• A. 0.13
• B. 1.06
• C. 4.77
• D. 2.12

Answer 1

Answer: (D)

2.12

Answer 2

The Bohr radius for hydrogen atom (n = 1) = 0.530Å

The radius of first excited state (n = 2) will be =

$0.530 \times \frac{n^{2}}{Z} = 0.530 \times \frac{(2)^{2}}{1} = 2.120Å$