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Across
  1. 1. A strong cloth used to make shoes
  2. 4. A kitchen utensil with holes in it used for draining food such as pasta
  3. 7. To give a possible but not yet proved explanation for something
  4. 9. The soft hair of sheep used to make pullovers
  5. 10. A synonym for “homogeneous mixture”
  6. 12. The vertical columns in the Periodic Table
  7. 13. The country where Dmitri Mendeleev was from
Down
  1. 2. A glass rod used to mix chemicals
  2. 3. The element with the Atomic Number 12
  3. 5. The element corresponding to the symbol Na
  4. 6. The element with the Atomic Number 17
  5. 8. A group sharing common attributes
  6. 11. The element corresponding to the symbol B