Ionic net equation for reaction of koh(aq) with cucl2(aq)

Is there a picture or answer choices?

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.

Ithink chemical bonding