Question

The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their what?

Answer 1

chemical properties

The periodic table is one of the cornerstones of chemistry because it organizes all the known elements on the basis of their chemical properties. A modern version is shown in Figure 2.7 "A Modern Periodic Table". Most periodic tables provide additional data  such as atomic mass  in a box that contains each elements symbol. The elements are listed in order of atomic number.