Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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 Check 

Across: 3. Shape of a decay graph 4. Given out by radioactive isotopes 6. Time taken for half the atoms to decay 8. Orbits the nucleus 9. Short wavelength electromagnetic wave 11. Nucleus that leads to radioactivity 12. neutral object in the nucleus 14. positive object in the nucleus

Down: 1. Radioactive ______ 2. ______ Decay, occurs when nuclei are unstable. 5. Particle that's a high speed electron 7. Particle that's a helium nucleus 10. same number of protons, different number of neutrons 13. charged atom