Balance the following oxidation-reduction reaction and indicate which atoms have undergone oxidation and reduction. Cu + HNO3 > Cu(NO3)2 + NO2 + H2O

i'm assuming that it's c.) red bank..

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.