5 protons would be about 6 neutrons would be about 3 electrons and 3 protons would have a total mass of about 6 neutrons and 5 protons would have a total mass of about 7 protons, 8 neutrons, and 7 electrons would have a total mass of about Blank 1: Blank 2: Blank 3: Blank 4: Blank 5: amu. amu. amu. amu.