Brian and ben are playing golf and both of their golf balls have landed on a flat portion of the green. the distance, d, between ben's golf ball and brian's golf ball is 20 feet. if = 40°, then about how far is ben's golf ball from the center of the hole?

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.