Both the Br2 and KMnO4 chemical tests were performed on the cycloadduct product. Upon addition of Br2 solution to the product, the solution became a red-orange color, which persisted for over 5 minutes. Addition of a KMnO4 solution to the product resulted in the formation of a persistent purple solution. From this data, draw the structure of the cycloadduct product. Explain your answer.

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.