The pH of a solution is 2.0. Which statement is correct?
Useful formulas include [H30+1 = 1070F, FOH-7-10 +0H, PH+pOH = 14, and [H30 [0H-]- 10-14

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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.