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(D) The energy of an electron in a hydrogen-like atom is given by the formula $E_n = -\frac{13.6 Z^2}{n^2} 	ext{ eV}$.As the principal quantum number

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at infinite distance from the nucleus

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(D) The energy of an electron in a hydrogen-like atom is given by the formula $E_n = -\frac{13.6 Z^2}{n^2} 	ext{ eV}$.As the principal quantum number $n$ increases,the value of $E_n$ becomes less negative,which means the energy increases.As $n 	o \infty$,the energy $E_n$ approaches $0$,which is the maximum possible energy for a bound electron.Therefore,an electron possesses maximum energy when it is at an infinite distance from the nucleus.

The maximum energy is possessed by an electron when it is present:

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