Chemistry

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Across
  1. 2. a measure of the amount of matter in a substance or an object
  2. 4. involves loss of electrons
  3. 5. involves a gain of electrons
  4. 6. an electron in an atom, ion, or molecule that is not connected to a single atom or covalent bond
  5. 7. can be measured in g/dm^3 or mol/dm^3
Down
  1. 1. pottery or 'burnt stuff'
  2. 3. what holds atoms together in molecules