Science quiz

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Across
  1. 3. foil used in Rutherford Alfa particle
  2. 4. it has no charge
  3. 7. Discovery of electrons
  4. 8. Positive electrode
  5. 9. same atomic number, different mass number
Down
  1. 1. Concept of the nucleus
  2. 2. Stationary orbits
  3. 5. Electronic configuration is 2,5
  4. 6. Canal rays