Periodic Table Crossword

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Across
  1. 2. positively charged ion
  2. 5. positively charged subatomic particle
  3. 7. neutrally charged subatomic particle
  4. 8. number of protons and neutrons in an atom
  5. 10. negatively charge subatomic particle
  6. 11. number of protons in an atom
  7. 12. region in an atom where you can probably find an electron
  8. 14. an atom that has gone through ionization
  9. 15. the process of adding or taking away electrons from an atom
Down
  1. 1. an electron in the outermost energy level
  2. 3. middle of an atom
  3. 4. vertical column of elements on the periodic table
  4. 6. states that properties of elements change in a predictable way when arranged by atomic number
  5. 9. horizontal row of elements on the periodic table
  6. 13. negatively charged ion
  7. 15. atom having the same number of protons but not the same number of neutrons as another atom of its element