Ion - GCSE Physics Definition

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons. In GCSE Physics, understanding ions is essential because they play a crucial role in various phenomena, such as electricity and chemical reactions. When an atom loses electrons, it becomes a positively charged ion. Conversely, when an atom gains electrons, it becomes a negatively charged ion. Ions are created in a number of ways. This includes friction, where rubbing objects together can remove electrons, by absorbing electromagnetic radiation which can give an electron enough energy to leave the atom, and chemical reactions.