Basic Concepts & Theories

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Across
  1. 2. The smallest, independent, and stable particle of a pure substance that retains all its fundamental properties.
  2. 4. The basic unit of matter whose name comes from the Greek word atomos, meaning indivisible.
  3. 5. A pure substance made up of only one type of atom that cannot be further divided by chemical reactions.
Down
  1. 1. A pure substance formed when two or more different elements combine chemically in a fixed ratio.
  2. 3. The scientist who proposed the atomic theory in 1807 to explain the nature of atoms.