How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 120 contain?

(A=P=E M-A=N: atomic #=protons=electrons and mass-atomic number=neutrons) There are 50 protons, 50 electrons, and 70 neutrons. Hope this helps! :)

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.