Atoms and Molecules Crossword

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Across
  1. 2. The sum of the protons and neutrons is the atomic ___
  2. 3. Dmitri Mendeleev created the periodic table of ___
  3. 4. Substance formed as a result of a chemical change
  4. 7. The vertical columns on the periodic table
  5. 8. The study of matter
  6. 9. The abbreviation for the names of elements are called the chemical ___
  7. 10. The total number of protons in the nucleus is the same as the atomic ___
  8. 12. Substances containing only one kind of atom
  9. 13. Protons have what kind of charge?
  10. 15. Neutrons have what kind of charge?
  11. 16. The horizontal rows on the periodic table
Down
  1. 1. Electrons have what kind of charge?
  2. 2. Atoms joined together
  3. 5. The center of an atom
  4. 6. The smallest piece of an element
  5. 8. The process that joins together different types of atoms is called a chemical ___
  6. 11. These travel around the outside of the nucleus
  7. 14. An atom that has gained or lost electrons