Chemistry

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Across
  1. 4. Number of protons
  2. 5. Fixed volume
  3. 7. Negatively charged
Down
  1. 1. A large collection of atoms
  2. 2. Average mass of the type of atoms
  3. 3. Positively charged
  4. 4. Smallest part of an element
  5. 6. The amount of space something occupies