Radioactivity

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Across
  1. 3. found at the centre of an atom, containing neutrons and protons
  2. 5. where two low mass nuclei come into very close contact with each other, so that the strong force fuses them
  3. 6. the radiation of energy by means of fast-moving subatomic particles.
  4. 8. the name of the man who discovered the nucleus
  5. 9. a subatomic particle with the symbol p or p+ and a positive electric charge of 1 elementary charge
  6. 10. the name of the man who discovered the neutron
  7. 12. a subatomic hadron particle that has the symbol n or n0 and which have no net electric charge
  8. 14. where a nucleus of an unstable atom loses energy by emitting particles of ionizing radiation.
Down
  1. 1. a process in which electromagnetic waves (EMR) travel through a vacuum or through matter-containing media
  2. 2. particles smaller than atoms
  3. 4. high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei
  4. 7. particles which consist of two protons and two neutrons bound together into a particle
  5. 11. an element with an abnormal amount of neutrons
  6. 13. electromagnetic radiation of extremely high frequency and therefore high energy per photon