Chemistry

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Across
  1. 3. Number of protons in the nucleus of an atom
  2. 4. A negative charge
  3. 5. Number of protons and neutrons in the nucleus of an atom
  4. 7. No charge
Down
  1. 1. The total mass of an atom
  2. 2. A positive charge
  3. 4. Pure substance that is made up of only one type of atom
  4. 6. Smallest part of matter