Radiation

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Across
  1. 6. an atom with the same number of protons and different number of neutrons
  2. 7. particle in the nucleus with positive charge and 1 mass
  3. 10. electromagnetic wave emitted by unstable nuclei
  4. 11. normally nuclei are
  5. 12. particle in the nucleus with 0 charge and 1 mass
  6. 13. happens when unstable nucleus gives out radiation
Down
  1. 1. the nucleus of a radioactive atom is
  2. 2. particle emitted by unstable nuclei, 2 protons and 2 neutrons
  3. 3. particle emitted by unstable nuclei, 1 electron
  4. 4. number of protons an element has
  5. 5. part of an atom with negative charge and 0 mass
  6. 8. part of an atom that contains protons and neutrons
  7. 9. number of protons + neutrons of an element