The Periodic Table

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