Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?

Which important property did Mendeleev use to classify the elements in

1.	Which important property did Mendeleev use to classify the elements in his periodic table and did he stick to that?
Answer» SOLUTION :He classified elements according to atomic weight. He could`N^(+)` stick for this and he accept that physical and CHEMICAL PROPERTIES are basic for that.