Answer :

i) The two criteria used by Mendeleev in creating his periodic table are:


a. Mendeleev arranged the elements according to their properties and in order of increasing atomic weights.


b. In the Mendeleev’s periodic table, vertical columns are called groups and horizontal rows are called periods.


ii) Mendeleev stated a periodic law. The law states that “Properties of elements are a periodic function of their atomic masses.”


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