Consider the reaction. 2 upper S upper O subscript 2 (g) plus upper O subscript 2 (g) double-headed arrow 2 upper S upper O subscript 3 (g).

When does the given chemical system reach dynamic equilibrium? when the forward and reverse reactions stop when the rate of the forward reaction is higher than the rate of the reverse reaction when the concentration of the reactants is higher than the concentration of the products when the rates of the forward and reverse reactions are equal

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.