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Across
  1. 4. Greek philosopher who suggested atoms.
  2. 8. Tiny particles that make up everything.
  3. 9. A substance made of only one kind of atom.
Down
  1. 1. Columns in the Periodic Table.
  2. 2. Element with symbol Na.
  3. 3. Rows in the Periodic Table.
  4. 5. Element with symbol O.
  5. 6. Gas whose atoms move freely.
  6. 7. Element with symbol He.
  7. 8. Means “cannot be divided.”