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Across
  1. 2. part of an atom that is neutral, lives on the nucleus
  2. 5. an ion with a positive charge, loses electrons
  3. 7. the electrons on the outside shell of an atom
  4. 10. the 7 rows on the side of the periodic table
  5. 11. part of an atom that is positive, lives in the nucleus
Down
  1. 1. an ion with a negative charge, gains electrons
  2. 3. part of an atom that is negative, lives in the electron shells
  3. 4. the 18 columns at the top of the periodic table
  4. 6. a full shell, 8 valence electrons
  5. 8. a stable particle that has the same number of protons and electrons
  6. 9. a charged particle that does not have the same number of protons and electrons