Chemistry about Atoms and the Periodic Table

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Across
  1. 2. the elements of Group 7 of the periodic table
  2. 5. the block that contains the Lanthanides and Actinides
  3. 6. it bears a positive charge
  4. 11. the elements of Group 8 of the periodic table
  5. 12. the elements of Group 2 of the periodic table
  6. 13. it is the columns that divide the periodic table
  7. 14. He proposed the Law of Conservation of Mass
  8. 16. the block that contains Groups 1A and 2A
  9. 18. it bears neither a positive nor a negative charge
  10. 19. the block that contains Groups 3A to 8A
  11. 20. It was discovered by Henry Moseley
Down
  1. 1. it bears a negative charge
  2. 3. the elements of Group 1 of the periodic table
  3. 4. designed the gold-foil experiment
  4. 7. the block that contains Group 1B to 8B
  5. 8. He proposed the Law of Definite Proportions
  6. 9. He proposed the 1st Atomic Theory
  7. 10. He discovered the x-ray
  8. 15. Greek word meaning indivisible
  9. 17. it is the rows that divide the periodic table