3-1/3-2

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Across
  1. 2. The smallest part of an element
  2. 3. An atom with the same number of protons and a different number of electrons
  3. 9. Electrons with _____ energy stay close to the nucleus
  4. 11. The vertical columns on the periodic table
  5. 13. The electrons on the outermost orbit
  6. 14. The "shell" that the electrons travels on
  7. 17. Cannot be broken down into any other substance
  8. 18. Has a negative charge
  9. 19. A diagram, mental image, mathematical statement, or object to represent something
Down
  1. 1. The sum of the protons and neutrons
  2. 2. The average mass for the isotopes of an element
  3. 4. The abbreviation of an element
  4. 5. The number of protons an atom has
  5. 6. Electrons with _______ energy go far from the nucleus
  6. 7. Has a negative charge
  7. 8. The center of an atom
  8. 10. The last name of the man who made the first periodic table
  9. 12. Has a positive charge
  10. 15. When two elements come together
  11. 16. The horizontal rows on the periodic table