Final answer:
The atomic mass was originally used to arrange elements but is no longer used in the modern periodic table.
Explanation:
Atomic mass was originally used to arrange elements on the periodic table but is no longer used to organize the modern version. The modern periodic table arranges elements in increasing order of their atomic numbers and groups atoms with similar properties in the same vertical column. This shift was due to the realization that the properties of elements are better correlated with their atomic numbers than atomic masses.
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