Nuclear Chemistry

3. responsible for unstable nucleus
5. holds protons and neutrons together in the nucleus
6. high energy emitted from a nucleus; made of electromagnetic waves; stopped by lead or concrete
10. atoms of the same element with same number of protons and different number of neutrons
13. to give off; to produce
14. involves valence electrons; atoms remain unchanged

1. loss of a high energy electron; stopped by wood or concrete
2. isotopes that emit radiation to become more stable
4. has the same mass as an electron but a positive charge
7. atoms often converted to different elements
8. occurs on it's own without external energy
9. discovered x rays
11. loss of a He nucleus; stopped by paper
12. the time required for 1/2 of a radioactive sample to decay into products