All changes saved 2. Answer the question below. Use the rubric in the materials for help if needed.
There is radiation all around you. Describe sources of natural radiation and sources of man-made radiation that you may
encounter. Use details to support 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.  

answermeridional ;