The structure of the atom

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Across
  1. 2. The smallest particle of a chemical element.
  2. 5. Tells you how many protons are in the atom.
  3. 7. Atom particle that have negative electrical charge.
Down
  1. 1. Tells you how many protons+neutrons there are.
  2. 3. Atom particle that have positive electrical charge.
  3. 4. Atom particle that have no electrical charge.
  4. 6. Protons and neutrons are grouped together.