The Periodic Table Crossword Puzzle

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Across
  1. 2. The symbol of a noble gas found in period 5.
  2. 5. Element with symbol "Hg".
  3. 6. The first element in group 6A.
  4. 10. The element preceding Copper in period 4.
  5. 11. A metal with an atomic mass of 108.
  6. 13. It is the heaviest noble gas.
  7. 15. Element with a symbol "Os" found in period 6.
  8. 16. The horizontal rows in the periodic table.
  9. 17. The element with the symbol "Ba".
  10. 18. Oganized the elements based on increasing atomic mass.
  11. 19. He placed the inner transition metals below the periodic table.
Down
  1. 1. Scientist who first arranged elements by increasing atomic number.
  2. 3. The first element in group 3A.
  3. 4. An element with an atomic mass of 14.
  4. 7. The element that has the atomic number 70.
  5. 8. An element usually found in smartphone batteries.
  6. 9. The vertical columns in the periodic table.
  7. 11. Element with the symbol "Na" and atomic number 11.
  8. 12. A metal found in period 6, group 4A.
  9. 14. The name of the group containing elements with a full valence shell.