Predict how decreasing the volume of the container used for the reaction below would affect the initial rate of the reaction, and explain your prediction.. h2 (g) + i2 (g)arrow 2 hi

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.