#7

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Across
  1. 3. opposite fission
  2. 7. Represented by the symbol (β)
  3. 9. Newton's cradle demonstrates this rule
  4. 11. The emission of energy in the form of ionizing radiation
  5. 12. Consists of two protons and two neutrons bound together in a particle
  6. 14. The difference between the predicted mass and the actual mass of an atom's nucleus
Down
  1. 1. Alpha particles, beta particles, and gamma rays are forms of this
  2. 2. The strongest force out of the four fundamental forces
  3. 4. Produces multiple fission
  4. 5. Mechanical, thermal, and sonic are types of this
  5. 6. opposite fusion
  6. 8. Has the most energy of any wave in the electromagnetic spectrum
  7. 10. Margaret Gowing coined this term in 1940
  8. 13. The time required for half of the atoms of a given amount of a radioactive substance to disintegrate