The difference between P and Proton
P is also abbreviation with the meaning: post, meaning after.
Proton is also noun with the meaning: 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.
check bellow for the other definitions of P and Proton
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Proton as a noun (particle):
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.