Use isotope notation to identify atomic number and mass number.

In the subtopic Size and mass of atoms, this learning objective focuses on use isotope notation to identify atomic number and mass number. It sits within A simple model of the atom, symbols, relative atomic mass, electronic charge and isotopes for AQA GCSE Chemistry 8462, so the explanation must keep the chemistry linked to Size and mass of atoms rather than drifting into a nearby idea. Approved keywords to use include mass number, isotope, ion. atomic number means the number of protons in the nucleus of an atom, which determines the element's identity Avoid the mistake of students often confuse atomic number with mass number when using isotope notation; instead, remember that atomic number refers to the number of protons, while mass number is the total of protons and neutrons. Use the notation correctly to distinguish between the two For exam answers, practice using isotope notation to clearly identify the atomic number and mass number of elements