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What was Mendeleev's greatest input to the periodic table that proved his periodic law correct?

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An Intiative by Sri Chaitanya

He arranged elements based on their atomic number.

He noticed that there was a pattern of reactivity repeating after every 8 elements.

He anticipates the existence (and properties) of new elements.

He recognizes the "law of triads" which became the groups.

answer is C.

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Detailed Solution

He realized that the physical and chemical properties of elements were related to their atomic mass in a repeating or 'periodic' way and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

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