History of the Periodic Table

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Across
  1. 4. Found properties repeat on the 8th element when arranged by atomic weight
  2. 6. Discovered noble gases
  3. 8. Created the element symbol system; determined the weight of 43 elements when bonded to oxygen
  4. 9. created a periodic table but didn't receive credit
Down
  1. 1. Discovered triads
  2. 2. Created the first periodic table & left gaps for undiscovered elements
  3. 3. Determined more accurate atomic weights
  4. 5. Added the Actinide Series to the Periodic Table
  5. 7. Arranged the elements by atomic numbers