First slide

Bohr's Model for Hydrogen Atom

Question

Which state of Be³⁺ has the same orbit radius as that of the ground state ofhydrogen atom?

Easy

A

3
B

2
C

4
D

5

Solution

From Bohr's atomic model, atomic radius for nth state is given by the formula,
$r = 0.529 \frac{n^{2}}{Z} \overset{0}{A}$
Since for Be, z=4
$\frac{n^{2}}{4} = \frac{1^{2}}{1}$
Hence, n=2

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