He then split the list of elements into several columns so that elements beside each other had similar ?

Properties

Explanation:

Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

To make a table of the elements, Dmitri Mendeleev sorted the elements according to their atomic weights. He then split the list of elements into several columns so that elements beside each other had similar properties.

Explanation:

Correct in Edmentum.

your answer would be “dry”