An element's is its row in the periodic table

Your question is not clear but if you can explain yourself i would be glad to .  just trying to : ))

Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

C, small, hard spheres with insignificant volumes