I am trying to do a Escape Room for science I don't get it please help me with this question is is one the pictures down below BTW I dont know what it is called, but I put it on a different thing because I dont know what science is on this thing

have a great day because if you dont you and i will be sad

the answer is c i took the test

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.