define atom and molecules
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The universe is made up of atoms, which contain protons (positively charged particles), neutrons (particles with no charge), and electrons (negatively charged particles). ... Molecules are formed when two or more atoms bond together. If molecules contain atoms of different elements, that substance is known as a compound.
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An atom a fundamental piece of matter. ... An atom itself is made up of three tiny kinds of particles called subatomic particles: protons, neutrons, and electrons.
A molecule, normally, is a group of two or more atoms which are chemically bonded together. Atoms of the same element or of different elements can join (with chemical bond) together to form molecules.
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