17.5 g of MgCl2 is added to enough water to make 150 mL of solution. Then an additional 85 mL of water is added.
What is the molarity of the final solution?

there is none because earth is stationary and flat.

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.