Calculate the energy of an electron in the first Bohr orbit of `He^(+)`.

Explanation

To calculate the energy of an electron in the first Bohr orbit of \( \text{He}^+ \), we can use the formula for the energy of an electron in a hydrogen-like atom:

\[ E_n = -\frac{2.18 \times 10^{-18} \, \text{J} \cdot z^2}{n^2} \]

Where:
- \( E_n \) is the energy of the electron in the \( n \)-th orbit,
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