The Periodic Table

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Across
  1. 2. the protons and ______ make up the atomic mass of an atom
  2. 3. the mass of both the protons and neutrons
  3. 10. what the symbol stands for
  4. 12. has no mass
  5. 14. depends on valence electrons
  6. 15. the center of an atom
  7. 18. also known as electron clouds
  8. 19. identity of an atom
  9. 20. the rows on the periodic table
Down
  1. 1. the right side of the periodic table
  2. 4. 8 valence electrons
  3. 5. the reactivity of metals
  4. 6. the only nonmetal element on the left side of the periodic table
  5. 7. the entire left side of the periodic table
  6. 8. located in outermost shell
  7. 9. the staircase on the periodic table
  8. 11. the representation of an element on the periodic table
  9. 13. non-reactive elements
  10. 16. the columns and rows
  11. 17. the number of protons