1. Chapter 25:
Nuclear Chemistry:

2. Isotope
particles with same number of protons but different number of neutrons
particles with same atomic number (Z), but different mass number

3. Henri Becquerel ruined some photographic plates with x-rays from a uranium source and radioactive decay was discovered in 1896.

4. Radioactivity
One of the pieces of evidence for the fact that atoms are made of smaller particles came from the work of Marie Curie ( ).
She discovered radioactivity, the spontaneous disintegration of some elements into smaller pieces.

5. Nuclear Reactions Equations
for reactants & products
balance total mass #
balance total charge

7. Spontaneous Radioactive Stability
Production of an  particle
Production of a  particle
Production of  rays
Spontaneous Fission

8. 1. production of a particle

10. 2. production of b particle

12. 3. production of g rays

14. 4. Spontaneous Fission

15. II. Nuclear Fission

16. Nuclear Fission
Sub-Critical
Critical
Supercritical

18. then radioactive decomposition:
½ life = 1.3 sec

19. then radioactive decomposition:
½ life = 1.3 sec

20. then radioactive decomposition:
½ life 18.3 months

21. then radioactive decomposition:
½ life 18.3 months

22. Other Types of Nuclear Reactions
Positron: a positive electron
207
K-capture: the capture of an electron from the first or K shell
An electron and proton combine to form a neutron.

25. III. Nuclear Fusion Example #1 Requires 40,000,000 K to
overcome electrostatic repulsion

26. How on earth???
Hydrogen bombs

27. How on earth???
Circular laser array