Isotopes are atoms with the same number of protons and electrons but different number of neutrons.
Extra for better understanding: Thus, the relative atomic mass (Ar) differs amongst the isotope. For example, Chlorine have 2 main isotopes with Ar of 35 and 37. The chemical property of the isotopes is the same but the physical property such as boiling point may change.
trees collect energy from sitting in the sun, the interact with their enviorment because they provide oxygen, and they reproduce when their fruit flowers or leaves fall off.
