Where is a proton in an atom

A proton (ancient Greek: proto = first) is an electrically positively charged particle. The name goes back to the physicist Ernest Rutherford, who was able to prove the existence of protons experimentally for the first time. Like neutrons, there are protons in the atomic nucleus. So protons belong to the Nucleons (Latin nucleus = core).

Protons (symbol: p+) consist of one down and two up quarks. At 1.007 u, the mass of a proton is roughly that of a neutron. Compared to an electron, a proton is 2000 times larger. The corresponding antiparticle to the proton is the antiproton.

The number of protons in the atomic nucleus determines the chemical element and this can be read off very easily in the periodic table using the atomic number. The atomic number, also called atomic number, corresponds to the number of protons in the atomic nucleus of the respective element. Carbon has a total of six protons, because it is listed under the atomic number 6 in the periodic table. The arrangement in the periodic table is not arbitrary, but depends on the physical properties of the elements.