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For example, oxygen atoms have 8 protons, hydrogen … What are protons, electrons and coulombs? Neutrons, protons, and electrons are the three subatomic particles that compose atoms. · what is a proton? Aluminum has 13 protons, 13 electrons, and 14 neutrons. Find out the proton definition, along with the mass of a proton and a protons charge. Their number of protons make them a unique type of element. To determine this, look first at the atomic number for aluminum, which … Protons :protons are subatomic particles that, together with neutrons, form the …