Atoms and Radiation

123456789
Across
  1. 1. Not particles but bursts of energy released after alpha or beta particles are emitted (2 words).
  2. 3. Electrons released during radioactive decay (2 words).
  3. 5. Occurs when a nucleus is unstable and begins to break down (2 words).
  4. 7. Negatively-charged subatomic particle.
  5. 8. Subatomic particle with no charge.
  6. 9. Positively-charged subatomic particle.
Down
  1. 2. Positively-charged particles with two protons and two neutrons released from an unstable nucleus (2 words).
  2. 4. The emission of ionising radiation or particles caused by the spontaneous disintegration of atomic nuclei.
  3. 6. An element with the same number of protons and different number of neutrons.