Atoms and the Periodic Table

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Across
  1. 1. smallest particle of an element
  2. 3. arrangement of elements by increasing atomic number
  3. 7. particles with a positive charge
  4. 9. particles with a neutral charge
  5. 11. vertical rows on the periodic table
  6. 12. area around the nucleus where electrons are found
  7. 13. the chemical symbol surrounded by dots that represent the number of valance electrons
  8. 14. particles with a negative electric charge
Down
  1. 1. weighted average mass of all isotopes of an element
  2. 2. small particles that make up proton & neutrons
  3. 4. horizontal rows on the periodic table
  4. 5. the number of protons in an atom's nucleus
  5. 6. sum of protons and neutrons in the nucleus
  6. 8. atoms of the same element that have different number of neutrons
  7. 10. the center of an atom