Question

what were the two certain used by mendeleev in creating his periodic table​

Answer 1

Atomic mass and similarity of chemical properties ( compounds formed by elements with oxygen and hydrogen )were the two criteria used by Mendeleev in his Periodic Table.

Answer 2

Answer:

He used the following two properties:

1. Elements are arranged in increasing order of their Atomic mass

2. Similarity of chemical properties (which he selected as the important factor in arranging elements). i.e. the element with similar chemical properties should be in the same group.

Explanation: