The laboratory assistant in your school has accidentally mixed alcohol with water in a beaker. Unfortunately, the school science laboratory ran out of the alcohol stock, which is required for starch test in the leaf. i. If you are asked to help the laboratory assistant in separating the mixture, which method will you use?
ii. Which component will be separated first? Why?​

what is the question here. i think you messed up.

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.