Quick Read
A proton sits in an atomic nucleus and carries positive electric charge.
Learn More
A proton contains quarks bound by the strong interaction. The displayed size is a representative diameter derived from its approximate charge radius.
In Depth
A proton is not a hard sphere. Its effective size depends on the measurement definition and the distribution of charge within it.
Scale measurement
1.68 fm · effective diameter
Quick facts
- It is a baryon.
- It carries one positive elementary charge.
- The displayed size is model-dependent.
Related objects
- part-of: Hydrogen atom