Figure 2 shows an incorrect diagram of the structure of an atom of 13-C-6 Explain why the diagram of the atomic structure shown in Figure 2 is incorrect.
Give a reason for your answer.​

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.