Question

Periodic Classification of element​

Answer 1

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Periodic classification of element are based on classification of atomic number

By Henry mosley.

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Answer 2

Answer:

Mendeleev's Periodic Table. Mendeleev arranged the elements based on their atomic masses. He observed that when the elements were arranged in increasing order of their atomic masses, there was a periodic recurrence in their physical and chemical properties.

@YogiChaudhary