Energy Level - GCSE Physics Definition

In the context of GCSE Physics, an "energy level" refers to the specific energies that electrons within an atom can have. These are quantified states, also called electron shells, that electrons occupy in the space surrounding an atom's nucleus, similar to rungs on a ladder. The lowest energy level is nearest to the nucleus and can hold a maximum of two electrons, while higher energy levels can accommodate more. When an electron gains or loses energy, it can move between these levels in a process known as electron transition. Understanding energy levels is crucial in explaining phenomena such as the emission and absorption of light in atomic spectra.