| Energy levels How1 #722774 The electrons orbit around an atom nucleus on layers called shells, each being associated with a certain energy level. This structure, driven by quantum mechanics, helps us explain why some chemical reactions are "easy" and others "difficult", ionisation and the light emitted by atoms. Similarly, this shell model can be used to describe the organisation of protons and neutrons in a nucleus and determine whether such nucleus is stable or decays quickly. |
|