Write the molecular equationfor when 2 drops of universal indicator is added to HCl. Then write the molecular equation(s) for when that same soluation recieves an addition of 3, 6, 9 and 12 drops of 1 M 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.