Chemistry Crossword puzzle

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Across
  1. 4. Different words for the rows and columns on the periodic table
  2. 6. How an element is identified
  3. 10. Located in in electron cloud and has a negative charge
  4. 13. Substances that are located on the stairs of the periodic table
  5. 14. The mass of an elements atom
  6. 16. Two parts of a atom that are equal to eachother
  7. 17. Located in the nucleus and has a positive charge
  8. 18. How the periodic table is arranged
Down
  1. 1. Substances located on the right side of the periodic table
  2. 2. Substances located on the left side of the period table
  3. 3. Something made up of one type of atom
  4. 5. The number of protons in a nucleus
  5. 6. The structure of an atom
  6. 7. The study of the makeup of chemical elements and their structure
  7. 8. The center of an atom
  8. 9. Rows and collumns of substances organized by atomic number
  9. 11. A group of electrons surrounding the nucleus
  10. 12. A representation of an atom
  11. 15. Smallest part of an element
  12. 19. Located in the nucleus and has a negative charge