The energy of an electron in the first orbit of $He^+$ is $-871.6 \times 10^{-20} \ J$. The energy of an electron in the first orbit of hydrogen is ...... .
- A$-871.6 \times 10^{-20} \ J$
- B$-435.8 \times 10^{-20} \ J$
- C$-217.9 \times 10^{-20} \ J$
- D$-108.9 \times 10^{-20} \ J$
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