third PT

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Across
  1. 3. electrons in the outermost energy level of an atom
  2. 4. outlined the Law of Conservation of Mass
  3. 6. visualized that electrons as rotating orbits around the nucleus like planets rotating around the sun
  4. 8. rows in the Periodic Table
  5. 12. formed when an atom gains or loses electrons
  6. 13. anything that has volume and mass
  7. 15. “atomos”
  8. 17. the ability of an atom to attract toward itself the electrons in a chemical bond
  9. 18. properties intermediate between metal and non-metals
  10. 19. negative ion
  11. 20. a separation process in which a mixture is passed through a filter
Down
  1. 1. columns of elements having similar chemical properties
  2. 2. amount of space occupied by matter
  3. 5. concluded that an atom was made up of very dense positively charged nucleus
  4. 7. are the distinguishing characteristics that is used to identify different samples of matter
  5. 9. proposed the Atomic Theory of Matter
  6. 10. outlined the Law of Definite Proportions
  7. 11. Plum Pudding Model
  8. 14. a separation process used in the experiment to separate naphthalene from salt
  9. 16. positive ion