chemistry

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Across
  1. 3. smallest particle of an element that can take part in a chemical reaction
  2. 4. the number of atoms present in a molecule of an element
  3. 6. the valency of sulphur is
  4. 7. always made up of elements combined in a certain ratio that always remains the same
Down
  1. 1. K is the symbol of
  2. 2. made by mixing two or more elements or compound in any ratio
  3. 5. smallest particle of an element or a compound that can normally exist independently