 Now, just to summarize the three key properties we covered in this video of particles, the first is spin, and the two key terms we need to keep in mind are that bosons have an integer spin quantum number, fermions have a half-integer spin quantum number. We also learned that forces and the forces that act on particular particles are very important. The two key terms you need to remember are that hadrons are acted on by strong and weak forces, whereas leptons are only acted on by the weak force. We also learned that there can be matter or ANC matter particles.