None. Protons and electrons are not constituents of a neutron. Both neutrons and protons are constituents of an atom's nucleus (core), while the electrons are situated in the electronic cloud around...
Indium, (In) atom number 49, has: 49 protons (same as atom number) 49 electrons (same as protons in the UNcharged neutral atom) 113-49=64 neutrons in In-113 isotope or 115-49=66 neutrons in In-115...
Polonium has 84 protons and electrons; the number of neutrons is different for each isotope:Number of neutrons = Atomic mass of an isotope - Atomic number of polonium (84)