Question

Which hydrogen-like species will have the same radius as that of Bohr's orbit of the hydrogen atom?

• A. $n=2,L{i}^{2+}$
• B. $n=2,B{e}^{3+}$
• C. $n=2,H{e}^{+}$
• D. $n=3,L{i}^{3+}$

Answer 1

Answer: (B)

$n=2,B{e}^{3+}$

We know that the expression for Bohr's orbit is $r_n=\frac{a_0{n}^2}{Z}=a_0$
But when $n=2,Z=4$.
Thus, the correct option is (B).