Which formula is used to calculate the energy of a species containing $1$ electron?
- A$E_n = -2.18 \times 10^{-18} \left( \frac{Z^2}{n^2} \right) \ J$
- B$E_n = -2.18 \times 10^{-18} \left( \frac{n^2}{Z^2} \right) \ J$
- C$E_n = -2.18 \times 10^{-18} \left( \frac{Z}{n} \right) \ J$
- D$E_n = -2.18 \times 10^{-18} \left( \frac{n}{Z} \right) \ J$
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