a stable particle with positive charge equal to the negative charge of an electron
"Every hydrogen atom contains a single proton, which is a stable positively charged particle that balances the negative charge of an electron."
A positively charged subatomic particle forming part of the nucleus of an atom and determining the atomic number of an element, composed of two up quarks and a down quark.
"A proton is a positively charged subatomic particle found in the atomic nucleus that determines an element's identity by its specific count of two up quarks and one down quark."
In plain English: A proton is a tiny, positively charged particle found inside an atom's nucleus that helps determine what element it is.
"Scientists use particle accelerators to study protons and understand how atoms work."
Usage: A proton is a fundamental component of every atom's nucleus that defines its chemical identity. Use this term when discussing basic physics or chemistry rather than colloquial expressions about positive attitudes.
The word "proton" comes from Ancient Greek, where it originally meant "first." It was coined in 1920 by physicist Ernest Rutherford to honor William Prout and to reflect the particle's status as a fundamental building block of matter.