Determine the molecular formula for each molecule. A five carbon ring with two C H 3 groups attached to carbon atoms in the ring. molecular formula: C7H16 A six carbon ring with two C H 3 groups and a C H 2 C H 3 group attached to carbon atoms in the ring. molecular formula:

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.