The periodic table includes all of the known elements in the world. how are elements arranged on the periodic table?

The elements in a periodic table are arranged in the increasing order of their atomic number. 

A1 a 2 a 3 ooh lol i think that's it

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.