Atoms are the basic building blocks of matter and the smallest units of chemical elements. Each atom consists of a nucleus, which contains protons (positively charged particles) and neutrons (neutral particles), surrounded by a cloud of electrons (negatively charged particles) that orbit the nucleus. Atoms combine in various ways to form molecules and compounds, giving rise to the diverse forms of matter in the universe. The number of protons in an atom's nucleus determines the element it represents, while the arrangement of electrons influences its chemical properties and behavior.
defintion of atoms
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