Drake's Crossword Puzzle

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Across
  1. 3. Another name for the rows in the periodic table.
  2. 4. When an atom gains or loses electrons
  3. 6. The creator of the periodic table.
  4. 8. The elements in the column of the far left on the periodic table.
  5. 11. All of the elements that are touching the zigzag line.
  6. 12. The particles in an atom that have a positive charge.
  7. 13. The elements in columns 3-12.
  8. 14. All of the elements to the left of the zigzag line (except one)
  9. 15. The weight of an element.
  10. 16. The number above an elements atomic mass.
  11. 19. A structure representing an atom/elements valence electrons.
  12. 20. The name of the rare earth metals in period 7.
Down
  1. 1. A name for the columns on the periodic table.
  2. 2. When an atom has an uneven number of protons and neutrons.
  3. 5. The elements in the far right column.
  4. 7. All of the elements to the right of the zigzag line.
  5. 9. The metals in the second column.
  6. 10. The particles in an atom that have a neutral charge.
  7. 17. The lightest metal.
  8. 18. The particles in an atom that orbit the nucleus.