Mr Cross' Periodic Table Crossword

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Across
  1. 4. Carbon, Nitrogen, and Xenon are all ______.
  2. 6. The vertical column on a periodic table.
  3. 7. The smallest unit of matter.
  4. 9. A subatomic particle with a negative charge.
  5. 11. The 19th element in the periodic table.
  6. 12. An alkali metal with the elemental symbol Li.
  7. 15. An atom with a charge is called an ______.
  8. 16. The 17th element in the periodic table.
  9. 17. The most reactive non-metal.
  10. 18. A noble gas with two electrons.
  11. 19. The horizontal row on a periodic table.
Down
  1. 1. Contains the protons and neutrons of an atom.
  2. 2. How many elements do you need to know off by heart?
  3. 3. A subatomic particle with no charge.
  4. 5. Calcium, Nickel, and Lead are all ______.
  5. 8. The father of the periodic table.
  6. 10. An alkaline earth metal with four protons.
  7. 11. A subatomic particle with a positive charge.
  8. 13. Element that only has one proton.
  9. 14. Boron, Silicon, and Arsenic are all ______.
  10. 16. The 20th element in the periodic table.