Atoms

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Across
  1. 3. the charges cancel each other
  2. 5. positively charged central core of an atom
  3. 7. the electrons in atoms
  4. 9. particle smaller than an atom
  5. 10. have a negative charge
  6. 11. have a neutral charge
  7. 12. have a positive charge
Down
  1. 1. if it has an excess of electrons
  2. 2. of an agglomeration of molecules
  3. 4. a negatively charged particle
  4. 6. the system of electrons
  5. 8. of protons exceeds the number of electrons