Radioactive Crossword!

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Across
  1. 1. type of radiation that is the nucleus of helium without electrons
  2. 6. the energy emitted from a source in the form of waves or particles
  3. 7. the process by which radioactive particles strip electrons from other atoms
  4. 10. type of radiation that can be stopped by a sheet of aluminum foil
  5. 11. the thin material that can block the slowest radiation
Down
  1. 2. a heavy metal used to block the strongest radiation
  2. 3. the tiny building block of the world
  3. 4. An unstable atom is also called _____________.
  4. 5. type of radiation that travels at the speed of light
  5. 8. the center of the atom where radioactive decay begins
  6. 9. one fruit that contains a tiny amount of radioactive material