atoms and periodic table

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Across
  1. 2. atomic mass an average of all the masses of all the isotopes that occur in nature for an element
  2. 4. the number of protons in the atom
  3. 6. elements that are found on the left side of the periodic table
  4. 11. a capital letter or combination of a capital letter and a small letter that is used to represent an element
  5. 12. table a chart that shows the classification of elements
  6. 13. the center of an atom where protons and neutrons are located
  7. 14. protons and neutrons can be subdivided into
  8. 15. atoms of the same element but with different number of neutrons
Down
  1. 1. elements in the middle of the periodic table being groups 4 through 7
  2. 3. vertical columns of elements
  3. 5. the total count of the neutrons and protons in the atom
  4. 7. elements that have some properties of both metals and nonmetals
  5. 8. the horizontal rows or elements
  6. 9. the regions around the nucleus occupied by electrons
  7. 10. the particles that move about the nucleus and have a negative charge