Chemistry

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Across
  1. 2. particle consisting of a nucleus of protons and electrons surrounded by a cloud of electrons
  2. 3. scientist trained in the study of chemistry
  3. 4. subatomic particle with negative charge found in an atom's shell
  4. 5. form of matter having constant chemical composition that can not be physically separated
  5. 7. lightest element: has atomic number 1
  6. 9. material made up of two or more different chemical substances not chemically bonded
Down
  1. 1. scale used to specify the acidity or basicity of an aqueous solution
  2. 2. force attracting atoms to each other and binding them together in a molecule
  3. 6. odorless, colorless class of chemical elements with low reactivity
  4. 8. chemical compound containing at least one oxygen atom and one other element