Question

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

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

Answer 1

Answer: (B)

1.06 Å

Answer 2

$r = \frac{n^{2}}{Z}(r_{0})$; ⇒ $r_{(n = 2)} = \frac{(2)^{2}}{2} \times 0.53 = 1.06Å$