Radioactivity

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Across
  1. 3. subatomic particle with a negative charge
  2. 5. Radiation that is an electromagnetic wave
  3. 6. the middle of an atom
  4. 9. subatomic particle with no charge
Down
  1. 1. atoms with the same number of protons but different numbers of neutrons
  2. 2. Radiation that is made of two protons and two neutrons
  3. 4. subatomic particle with a positive charge
  4. 7. orbitals that electrons go around the nucleus on
  5. 8. Radiation that is an electron