The Periodic Table

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Across
  1. 3. the name given to the elements in group 1 of the periodic table
  2. 4. horizontal rows on the periodic table
  3. 6. the name given to the six elements in group 2
  4. 7. the name given to the least reactive group in the periodic table
  5. 8. a particle without an electric charge in the nucleus
  6. 9. two or more elements chemically combined
  7. 10. a substance made by combining two or more elements physically
  8. 11. a pure substance which can't be broken down into more pieces
Down
  1. 1. located on shells around the nucleus
  2. 2. a group in the periodic table with 7 electrons in their shell
  3. 5. positive charge, same as the atomic number
  4. 6. Equal to the number of protons in the nucleus