Periodic Table

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Across
  1. 7. Name of outermost electrons
  2. 9. Created a universally accepted list of the elements
  3. 10. Noticed similarities between groups of elements
  4. 11. Families/groups of elements
Down
  1. 1. Made one of the first lists of elements
  2. 2. Arranged by atomic mass, elements had pairs every 8th element
  3. 3. Left blank spaces in the table for elements yet to be discovered
  4. 4. The name of each row on the table
  5. 5. Properties of the elements vary in a periodic way according to their atomic numbers
  6. 6. Used X-ray spectroscopy to determine atomic number
  7. 8. Published The Skeptical Chemyst