Parts of an atom

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Across
  1. 4. When there are more protons than electrons
  2. 9. Positively charged part of an atom
  3. 10. Number of protons in an element
  4. 11. chart that organizes the elements
  5. 13. When there is a different number of neutrons in an atom
  6. 15. the center of an atom
Down
  1. 1. Smallest piece of matter
  2. 2. Neutral part of an atom
  3. 3. electrons that are farthest away from the nucleus and are in the last energy level
  4. 5. Smallest particle of a substance
  5. 6. When there is a unequal amount of protons and electrons
  6. 7. Unit of matter that is important to structure of all matter
  7. 8. Mass of an atom
  8. 12. When there are more electrons than protons
  9. 14. Negatively charged part of an atom