Put simply, without atoms the universe would not exist. This is because atoms are the basic building blocks of matter. What exactly is meant by matter? In the physical and chemical sciences, "matter" is defined as that which occupies space and possesses rest mass, especially as distinct from energy. So in a universal nutshell, "matter" is everything. Atoms are made up of three basic subatomic particles: protons, neutrons, and electrons. Protons are subatomic particles that maintain a positive electrical charge. Neutrons are subatomic particles that have neither a positive nor a negative electrical charge, i.e. neutral. Protons and neutrons combine to make up an atom's nucleus. Electrons, the final subatomic particle type, maintain a negative electrical charge and orbit the atomic nucleus like a cloud. So then what are molecules? Molecules are nothing more or less than atoms that are attracted to other atoms enough to form a bond. A valence bond.
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