Mandeleev was a Russian scientist who realised all of the patterns of elements. He created the modern periodic table in 1869.
He found that the properties of all elements had a relation to atomic mass in a "periodic way". He made the table so that the groups with similar properties were in vertical columns.
Because of this way of arranging, there were gaps in the table, but Mandeleev just assumed this was because these elements hadn't been discovered yet. And he was right!
He used Newlands theory as a base, but Mandeleev's was backed up from the new discoveries made which fit in to the gaps.
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