MCQ
Which orbit of $Be^{+3}$ has the same orbit radius as that of the ground state of hydrogen atom
- A$3$
- ✓$2$
- C$4$
- D$5$
✓
Answer
Correct option: B.
$2$
b
From Bohr's atomic model, atomic radius for nth state is given by the formula,
From Bohr's atomic model, atomic radius for nth state is given by the formula,
$r =0.059 \frac{ n ^2}{ z } A$
Since for $Be , z =4$
$\frac{ n ^2}{4}=\frac{1^2}{1}$
Hence, $n=2$
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