Chemistry Crossword Puzzle

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Across
  1. 2. Any region that has the same ratio of substances as any other region
  2. 3. Average mass of all the isotopes of an element.
  3. 5. Atoms of the same element that contain different numbers of neutrons
  4. 7. The arrangement of electrons in the orbitals of an atom
  5. 11. Different components can be seen as individual substances
  6. 13. An integer that specifies a quantized energy level
  7. 17. Replicated an object on a convenient scale
  8. 18. Homogeneous mixture in which all components are dissolved in the same phase
  9. 19. Gradual change of any property in the elements across a period of the periodic table
  10. 20. Describes the behavior of a system
Down
  1. 1. Number of protons each atom contains
  2. 4. Total number of nucleons an atom contains
  3. 6. Shiny, opaque, and conducts heat/electricity
  4. 8. Force of attraction between two atoms that holds them together
  5. 9. Located at upper right of periodic table
  6. 10. Homogeneous mixture where various components are finely mixed, NOT dissolved
  7. 12. Light consists of a stream of energy packets
  8. 14. Exhibits some properties of metals and nonmetals
  9. 15. Protons and Neutrons
  10. 16. Vertical column on the periodic table