Structure of Atom

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Across
  1. 3. Units used to measure the mass of atoms
  2. 5. Positive charge located in the nucleus Central part of an atom
  3. 6. Elements found on the left side of the periodic table
  4. 9. A combination of two or more pure substances in which each pure substance retains its
  5. 11. Greek philosopher that suggested the existence of atoms
  6. 13. A thing that is composed of two or more separate elements
  7. 14. Anything that has mass and takes up space
  8. 16. Elements found on the right side of the periodic table
  9. 18. Negative charge located around the nucleus
  10. 19. mass Total number of protons and neutrons in the nucleus of an atom
Down
  1. 1. A column, or family in the periodic table
  2. 2. Greek word for "indivisible"
  3. 4. All elements are made up of
  4. 7. A substance consisting of atoms which all have the same number of protons
  5. 8. A row across the periodic
  6. 10. Two or more atoms with the same atomic number but different atomic masses
  7. 12. chemical properties
  8. 14. A measure of the amount of matter in an object
  9. 15. A chart of all known elements
  10. 17. A part of the atom that has neither a positive or negative charge