My first goal is to write about Nuclear and Atomic Physics. The College Board says that 10% of the Physics AP B test will be Atomic physics and Quantum effects and another 5% being Nuclear Physics.

Atomic Physics and quantum effects

1. Alpha particle scattering and the Rutherford Model
2. Photons and the photoelectric effect
3. Bohr model and energy levels
4. Wave-Particle duality

Nuclear Physics

1. Radioactivity and half-life
2. Nuclear reactions (including conservation of mass number and charge, and mass-energy equivalence)