Mr Cross' Periodic Table Crossword

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