Parts of an Atom

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Across
  1. 4. How many parts does an atom have?
  2. 6. Which part has no electrical charge?
  3. 7. What is the center of an atom?
Down
  1. 1. What makes up everything?
  2. 2. Which part has a negative electrical charge?
  3. 3. Which part has a positive electrical charge?
  4. 5. Are all atoms the same size?