The formula of ethanol is C2H5OH. Carbon (C) has 6 protons and electrons and 6 neutrons, hydrogen (H) has 1 proton and electron, and no neutrons, and oxygen has 8 protons and electrons, and 8 neutrons. Nr. Of protons = nr. Of electrons: 2x6 + 6x1 + 1x8 = 26; nr. Of neutrons : 2x6 + 1x8 = 20.