Which state of the triply ionised beryllium, `Be^(3+)` has the same radius as that of the ground state of hydrogen atom?

Explanation

To determine which state of the triply ionized beryllium ion, \( \text{Be}^{3+} \), has the same radius as that of the ground state of the hydrogen atom, we can follow these steps:

### Step 1: Understand the formula for the radius of an electron in a hydrogen-like atom
The radius \( r \) of an electron in a hydrogen-like atom is given by the formula:
\[ r = \frac{0.529 \, n^2}{Z} \]
where:
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