Atomic Theory and Periodic Table

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Across
  1. 5. Particle that has no charge
  2. 8. Average mass of all the isotopes of that element
  3. 9. All atoms of the same element have the same number of protons
  4. 10. Same number of protons but with a different number of neutrons
  5. 12. Smallest particle that still can be considered an element
  6. 13. Columns or "Families" on the periodic table
Down
  1. 1. Negative particle of an atom
  2. 2. One- or Two- letter abbreviation
  3. 3. A chart showing all of the elements arranged according to the repeating pattern of their properties
  4. 4. Positive particle of an atom
  5. 6. Dense center of an atom
  6. 7. Sum of protons and neutrons
  7. 11. Rows on the periodic table