Particle interactions

Four fundamental interactions: gravity, electromagnetic, weak nuclear, strong nuclear. (The strong nuclear force may be referred to as the strong interaction.)

The concept of exchange particles to explain forces between elementary particles.

Knowledge of the gluon, Z⁰ and graviton will not be tested.

The electromagnetic force; virtual photons as the exchange particle.

The weak interaction limited to $\beta^{-}$ and $\beta^{+}$ decay, electron capture and electron–proton collisions; and as the exchange particles.