Which solution contains 0.1 mol of sodium hydroxide? C. 100 cm3 of 1.0 mol dm-3 NaOH
D. 1000 cm3 of 1.0 mol dm-3 NaOH
B. 10 cm3 of 0.1 mol dim-3 NaOH
A. 1 cm3 of 0.1 mol dm-3 NaOH

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.