When sugar is mixed with water, equilibrium is reached when: a. the dissolved sugar molecules are evenly distributed throughout the solution.
b. molecules of sugar stop moving.
c. two tablespoons of coffee are added.
d. water and sugar molecules are moving at the same speed.
e. there is the same number of water molecules as dissolved sugar molecules.

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.