History of the Periodic Table

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Across
  1. 2. John Dalton arranged the known elements only in order of ______________.
  2. 6. John Newlands noticed that the properties of every _____________ element were similar.
  3. 8. The name of a row on the periodic table.
  4. 9. Mendeleev’s first name.
  5. 11. The name of the negatively charged particle that surrounds an atom’s nucleus.
  6. 12. Which noble gas did Mendeleev place out of order to make it fit with the others in its group?
Down
  1. 1. How many known elements did Mendeleev have to work with?
  2. 3. The atomic mass of potassium.
  3. 4. The element with the chemical symbol Na.
  4. 5. The ‘law of octaves’ only worked up to which element?
  5. 7. The nationality of Mendeleev.
  6. 10. The atomic particle that defines an element’s position in the periodic table.