What did Newlands notice about the periodic table that Dalton didn't?

Newlands observed a pattern in the properties of elements when arranged by increasing Atomic Mass, leading him to propose the Law of Octaves. He noticed that elements with similar chemical properties appeared every eighth element, a concept Dalton did not recognize. This observation highlighted the periodicity of element properties, laying groundwork for later developments in the Periodic Table. Newlands' work emphasized the systematic nature of elemental relationships, which was not fully appreciated by Dalton.