Integrated Earth Lectures & Notes
Isotopes & Isotopic Abundance
Utilize the PhET simulation below to practice and assess your understanding of isotopes. Remember, mass numbers apply to individual atoms (isotopes) and atomic masses to bunches of isotopes. In the simulation, you can make isotopes - individual atoms of the same element, differing by their numbers of neutrons; as well as mixing isotopes, looking at the impact of abundance upon average atomic mass.
Isotopes to Nuclear Reactions
Visit this JINA animation/movie: Nuclear Physics; feel free to skip the discussion of nuclear equations (the seventh section).
Here are the weak force notes, through nucleosynthesis.
This will only be up for a little bit.