The Development of The Periodic Table

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Across
  1. 4. Horizontal row in the Periodic Table.
  2. 6. The number of these particles determines the arrangement in the modern Periodic Table.
  3. 7. Scientist who introduced the Law of Octaves.
  4. 8. For elements with 3 to 8 valence electrons, add __________ to find the group number.
  5. 9. Law stating that every eighth element shows similar properties.
  6. 11. The number of filled __________ determines the period of an element.
Down
  1. 1. Vertical column in the Periodic Table.
  2. 2. What was Johann Dobereiner’s main contribution to the Periodic Table?
  3. 3. Scientist who arranged elements by increasing proton number.
  4. 5. Scientist who grouped elements into gases, non-metals, metals, and metal oxides.
  5. 10. Number of outermost electrons that determines the group of an element.