How does the radius of orbit change with the principal quantum number?

Explanation

To determine how the radius of an orbit changes with the principal quantum number, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Bohr's Model**: According to Bohr's theory of the hydrogen atom, the radius of the nth orbit (or shell) is given by the formula:
\[ r_n = \frac{0.529 \, n^2}{Z} \, \text{angstroms} \]
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