Estimate the amount of lime and soda ash required if a split flow treatment system is used to achieve an overall hardness of 100 mg/L as CaCO3. Assume the treatment system residual hardness is 40 mg/L as CaCO3.

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.