In an element’s square on the periodic table, the number with the greatest numerical value represents the number of neutrons. number of electrons. atomic number. atomic mass.

I think it's the mass number because the atomic # and # of electrons are the same so since there isn't an option to choose both you can rule them out and the # of neutrons is the mass number - the atomic # so that rules out the # of electrons so that leaves the Mass # so I think that that is the biggest one.