Atoms Crossword Puzzle

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Across
  1. 1. The building blocks of matter
  2. 2. The number at the top of a chemical element in the periodic table
  3. 5. Positively charged particle in the nucleus
  4. 8. What is the size of the proton
  5. 9. Electrons go around the nucleus in what?
Down
  1. 1. The number at the bottom of a element on the periodic table
  2. 3. Negatively charged particle outside the nucleus
  3. 4. Where you can find all the elements in one place
  4. 6. No electrical charge particle in the nucleus
  5. 7. Where protons and neutrons are located