What was Dmitri Mendeleev's greatest contribution to the history of the periodic table that proved his periodic law to be correct?

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He realized that there was a pattern of reactivity which repeated every 8 elements

He identified the "law of triads" which became the groups

He predicted the existence (and properties) of new elements

He arranged all of the known elements by their atomic number

answer is B.

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Detailed Solution

When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that then-unknown elements existed with properties appropriate to fill those gaps. He named them eka-boron, eka-aluminium, eka-silicon, and eka-manganese, with respective atomic masses of 44, 68, 72, and 100.

Hence, It can be said that Dmitri Mendeleev's greatest contribution to the history of the periodic table was that he predicted the existence of new elements, this proved that his periodic table is correct.

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