The energy of an electron is the amount of work required to move an electron from a reference point to its current position in an electric field.
The energy of an electron is directly related to its position in an atom. The farther an electron is from the nucleus, the higher its energy level. This is because the electron is held less tightly by the positive charge of the nucleus at a greater distance.
The energy level of an electron in an atom is determined by its principal quantum number, which corresponds to the electron's energy level. The higher the principal quantum number, the higher the energy level of the electron.
The energy of an electron can be changed by absorbing or emitting photons of light. When an electron absorbs energy from a photon, it can move to a higher energy level. Conversely, when an electron emits energy in the form of a photon, it moves to a lower energy level.
No, the energy of an electron is not constant. It can change depending on its interactions with other particles or electromagnetic fields. For example, when an electron is in a strong electric field, its energy will increase, and when it is in a weak electric field, its energy will decrease.