Question

Why does the energy of an electron increase as it moves away from the nucleus of an atom?

Answer 1

Basically when the electron is close to the nuclear ...it has more nuclear charge between them ..which requires a lot of enthalpy to separate them....but radiall when the electrons are far away from the nucleas they increase their own energy when they jump from one orbital to the another orbital ....such that their energy increases....

Answer 2

As the distance from the nucleus increases, the levels get closer together and contain more-energetic electrons (Figure 5.4). The energy of an electron in one of the levels at a considerable distance from the nucleus is greater than that of an electron in a closer level. FIGURE 5.4 Energy levels.