Question

In the classification of the then known elements, Mendeleev was guided by two factors. What are those two factors?

Answer 1

Answer:

The short answer would be

Physical properties of the elements

Chemical reactivity ( mainly towards oxygen)..

I appreciate any error in my answer to be pointed out as it has been some time since I studied this

Answer 2

Answer:

Guidance to Mendeleev was provided by the following two factors: 1) The first factor was the increasing atomic mass. 2) The second factor was grouping together of elements having similar properties.

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