Periodic Table Crossword

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Across
  1. 2. The name of the element with the atomic number 20.
  2. 3. The name of the element with the atomic number 3.
  3. 7. The larger two sub-atomic particles (they are positively charged and neutral).
  4. 10. Matter made up of only one type of atom.
  5. 12. The quantity of matter contained in an element (it's weight).
  6. 14. The table that classifies elements.
  7. 15. Elements in the same group have these in common.
Down
  1. 1. The smallest of the sub-atomic particles (determines which group its in).
  2. 4. The symbol for this element is "Ar".
  3. 5. The name of columns on the periodic table.
  4. 6. The far right hand group that contains the special, non-reactive elements.
  5. 8. The name for the two letter code each element has.
  6. 9. The name of the element with the atomic number 6.
  7. 11. The name of rows on the periodic table.
  8. 13. The symbol for this element is "Si".