What information did mendeleev have about the elements he organized into a periodic table

How can you increase the strength of an electromagnet?

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)

Which of the following is not a physical property of mattera. melting pointb.heat of combustionc. viscosityd. boiling point