Question

two criteria used by mendeleev in making periodic table

Answer 1

atomic weight is the one

Answer 2

$\huge\underline\bold\pink{Answer}$✨✨

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.