> [!summary] Protons are composite particles and were discovered by the gold foil experiment. >[!info]+ Read Time **⏱ 1 min** # Definition Protons are composite particles, made up of 3 quarks. They were discovered experimentally by the gold foil experiment. Which bombarded nitrogen gas with alpha particles. The experiment showed that hydrogen nuclei came out of the interaction with a positive charge, which was called a proton. | Basic Properties | Value for Electrons | | ---------------- | ----------------------- | | Symbol | $p^+$ | | Charge | $+1.6\times 10^{-19}C$ | | Mass | $1.67\times 10^{-27}kg$ | # Resources <iframe width="560" height="315" src="https://www.youtube.com/embed/XBqHkraf8iE?si=miNi2njxjtI_rYoi" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>