Periodic Table: Crossword Puzzle

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Across
  1. 3. The number of groups on the periodic table
  2. 6. The person who created the periodic table in 1869 to show trends between elements
  3. 7. The second group of the periodic table
  4. 9. Description of the elements on the left side of the periodic table
  5. 11. The number of noble gases on the periodic table
  6. 12. Radii from left to right and increases from top to bottom
Down
  1. 1. The number of periods there are on the periodic table
  2. 2. The element with an atomic number of 1
  3. 4. Description of the elements on the right side of the periodic table
  4. 5. increases from left to right and decreases from top to bottom
  5. 8. The first group of the periodic table
  6. 10. The number of elements on the periodic table that occur in nature