Question

What were the differences between the classification of elements by Mendeleev, Dobereiner, and Newlands?

Answer 1

Dear student,
Dobereiners Triads are groups of three elementsthat were formed in increasing order of atomic masses and according to simiar physical properties between the three elements.

2.John Newlands said that every eighth element from the first had similiar physical properties to the first. But his law worked only till calcium.He also said that there will be only 56 elements discovered.But after that many have been discovered.

3.Mendeleev stated that when elements are arranged in increasing atomic masses then the elements of similiar physical properties occur after regular intervals.
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