An atom is the basic unit of matter that makes up all elements. It is the smallest unit of an element that can participate in chemical reactions. Atoms contain three subatomic particles: protons, neutrons, and electrons.
A molecule is a group of atoms bonded together. A molecule can be made up of atoms from the same element (like oxygen, O2) or from different elements (like water, H2O).
Atoms are the smallest unit of an element that can participate in chemical reactions, while a molecule is a group of atoms bonded together. A molecule can be made up of one or more atoms.
Atoms are typically gaseous and cannot be seen with the naked eye, while molecules can exist in various physical states like solid, liquid, and gas, depending on the type of molecule.