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Across
  1. 2. the amount or quantity of heaviness
  2. 6. a usually irreversible reaction involving the rearrangement of the atoms
  3. 9. the state or quality of being hard
  4. 12. the quality of a distinct object or body in having an external surface
  5. 14. any substance that undergoes a chemical change in a given reaction. law of conservation of mass
  6. 15. highly ionized gas containing an approximately equal number of positive ions and electrons
  7. 18. an act or instance of going or moving around.
  8. 20. states that for any system closed to all transfers of matter and energy
  9. 23. composed of molecules that move freely among themselves
  10. 24. an elementary particle having no charge
  11. 25. the integer nearest in value to the atomic weight
  12. 27. having three dimensions
  13. 28. the smallest component of an element having the chemical properties of the element
  14. 29. a positively charged elementary particle
Down
  1. 1. the positively charged mass within an atom, composed of neutrons and protons,
  2. 3. one of a class of substances that cannot be separated into simpler substances
  3. 4. the property of a substance that activates the sense of smell
  4. 5. consists of the chemical formulas of the reactants and the chemical formula of the products
  5. 6. a process that leads to the transformation of one set of chemical substances
  6. 7. the quality of an object or substance with respect to light reflected by the object
  7. 8. a substance possessing perfect molecular mobility
  8. 10. the state or quality of being dense
  9. 11. the visual and especially tactile quality of a surface
  10. 13. The region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital.
  11. 15. a substance obtained from another substance through chemical change
  12. 16. a usually reversible change in the physical properties
  13. 17. the amount of space
  14. 19. a table illustrating the periodic system, in which the chemical elements
  15. 21. the number of positive charges or protons in the nucleus of an atom of a given element
  16. 22. a body of coherent matter
  17. 26. an elementary particle that is a fundamental constituent of matter