science

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Across
  1. 2. Unstable particles transform into stable particles
  2. 3. when one reaction causes several more reactions and so on
  3. 5. central core of an atom which consists of protons and neutrons
  4. 7. highly radioactive waste that is hard to get rid of
  5. 8. energy that can travel through space
  6. 9. use of nuclear reactions to power stuff
  7. 11. Nucleus splitting into two
Down
  1. 1. Two small nucleus combine
  2. 4. time it takes for half of a substance to decay
  3. 6. different forms of the same element
  4. 9. center of an atom
  5. 10. It makes up everything