Atoms and the Periodic Table

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Across
  1. 3. electrons are found on this part of an atom
  2. 4. positively charged particle in the nucleus
  3. 8. one to two letter abbreviation for an element
  4. 9. maximum number of electrons in n=1
  5. 10. protons and neutrons are found in this part of an atom
  6. 11. no charge
  7. 12. maximum number of electrons in n=3
Down
  1. 1. mass of an element (protons+neutrons)
  2. 2. chart that lists all known elements\
  3. 5. neutral particle in the nucleus
  4. 6. negatively charged particle in the orbitals
  5. 7. number of protons in an element