Structure of Atom

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