What were the criteria used by Mendeleev in creating his his periodic table?

Well done Annithan and Sree. Keep posting your answers. You answered correctly that the criteria of Mendleev periodic table was relative atomic mass. He organized the elements into horizontal rows (periods) and columns  (group) in order of their increasing relative atomic mass. According to him the elements showing similar chemical properties belong to the same group.

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 atomic masses and chemical properties

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He arranged the Elements on the basis of 

Fundamental properties

Atomic masses

similarity of chemical properties 

he concentrated on compounds formed by elements wt O2and H2

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