structure of matter

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Across
  1. 3. a substance formed by the physical change of 2 or more element in random ratios
  2. 5. the result of a chemical reaction in which the reactants an products are represented by symbols
  3. 7. the elements or compounds that take part in a chemical reaction
  4. 8. the number of atoms of each element in a compound,symbols and valencies
Down
  1. 1. the rearrangement of the elements form new compounds
  2. 2. the number of atoms present in a molecule of an atom
  3. 4. an abbreviation of a chemical element
  4. 5. a substance formed by the chemical change of 2 or more elements in fixed proportions
  5. 6. a measure of the combining capacity of an element or a group