Periodic Table

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Across
  1. 3. Short form of Sodium (2 letters)
  2. 5. A substance made up of only one kind of atom (7 letters)
  3. 8. The number of protons in an atom (12 letters)
  4. 10. Atomic number of Oxygen (2 letters)
  5. 12. The father of the modern periodic table (8 letters)
  6. 13. Symbol of element Iron (2 letters)
  7. 14. Element with atomic number 1 (8 letters)
Down
  1. 1. Most reactive group of non-metals (8 letters)
  2. 2. Inert elements belong to this group (5 letters)
  3. 4. Horizontal rows in the periodic table (7 letters)
  4. 6. Element used in light bulb filaments (8 letters)
  5. 7. Non-metal that is a good conductor of electricity (6 letters)
  6. 9. Vertical columns in the periodic table (6 letters)
  7. 11. The only metal that is liquid at room temperature (7 letters)
  8. 12. Metal used in making thermometers (7 letters)