In what stage of wastewater treatment are large objects such as rags, sticks and garbage removed from influent?
1.primary treatment
2.secondary treatment
3.tertiary treatment
4.septic tank treatment

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.