Hi, please could someone tell me the difference between mass number and relative atomic mass? On videos I watched they keep saying that on the periodic table for elements we say mass number but it should relative atomic mass which means total number of protons and neutrons but that doesn’t make sense because it actually means average weighted mass of all the atoms of the atoms relative to 1/12th of the mass of a C-12 atom so idk which one is right?
Also is relative atomic mass basically the average of all the atoms of the different isotopes of an element?
Thank you!!