Elements in the periodic table

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Across
  1. 3. The element that diamonds are made of.
  2. 5. The scientist who proposed the Law of Octaves.
  3. 7. consists of a single atom
  4. 8. Horizontal rows on the periodic table are called _____.
  5. 10. Symbol for helium.
  6. 12. Symbol for sodium.
  7. 15. Metals are usually good conductors of _____.
  8. 16. a molecule that consists of two atoms.
  9. 17. A pure substance made of only one kind of atom.
Down
  1. 1. The scientist who proposed the atomic theory and made a link between atoms and elements.
  2. 2. Vertical columns on the periodic table are called _____.
  3. 4. Basic unit of a chemical element.
  4. 6. The scientist who created the first periodictable.
  5. 9. Ancient Greek philosopher who theorized the existence of atoms.
  6. 10. The lightest element.
  7. 11. Element found in period 3 group 1.
  8. 13. Group 1 elements are known as ______ metals.
  9. 14. Nonmetals are often poor conductors of ____.