Answer: The electron must release its extra energy.
Step-by-step explanation:
When all of the electrons of an atom are in the lowest state possible, we say that the atom is in its ground state. When they are not in the lowest possible energy level, we say the atom is in an excited state.
An atom changes from a ground state to an excited state by taking on energy from its surroundings in a process called absorption. The electrons in the atom absorb the energy and jump to a higher energy level.
In the reverse process, emission, the electrons return to the ground state by releasing the extra energy they absorbed. This energy is released in the form of photons (small energy particles).
Images attached below for further understanding of material.
Source: dept.harpercollege.edu.