MATTER

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Across
  1. 4. suggested the use of alphabets instead of symbols
  2. 5. either element or compound
  3. 7. anything that has mass
Down
  1. 1. sorted all discovered elements in a periodic table
  2. 2. started using the term 'elements'
  3. 3. either homogeneous or heterogeneous
  4. 6. first scientist to use symbols to represent elements