If the system is at dynamic equilibrium, which statement is true? Sublimation of the NH4CI crystals stops. Solidification of the NH4CI vapors stops. The rate of sublimation of the NH4CI crystals is equal to the rate of solidification of the NH4CI vapors. The rate of sublimation of the NH4CI crystals is higher than the rate of solidification of the NH4CI vapors.

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.