Before knowing, what is energy of electron, we should know how is energy added to electron if it goes to higher levels.
Atom jumps from a ground state to any excited state by taking the energy from its surroundings and this process is called absorption.
Electron absorbs the energy and jumps to the higher energy level.
Whereas in the reverse process, emission happens i.e. the electron returns to the ground state by releasing the extra energy which was absorbed while excitation.
Electron present in the first energy level, it must have exactly -13.6 eV of energy.
The formula to find out the energy of electron at nth orbit is mentioned in the figure.
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