Across
- 4. one atom splits into smaller particles
- 7. positivly charged ion
- 10. two atoms collide and become helium and an extra atom
- 11. ping pong balls and mouse traps
- 12. how long it takes for half of something to decay
- 14. also the amount of protons
Down
- 1. a big particle and cannot penetrate skin
- 2. a nuetral charged particle
- 3. atom with a different amount of protons
- 5. a small single electron and can penetrate skin but is stopped by aluminum
- 6. decay process of gamma rays
- 8. atoms 83 and higer are this
- 9. below the atomic number and how heavy an element is
- 13. the center of an atom