Explain why there is a change in chemistry when Cu replaces graphite as the anode but not when Cu replaces graphite as the cathode. Explain not only why a new chemistry is observed, but also why the chemistry observed with the graphite anode is not observed.

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1 is the answer to this problem

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.