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The discovery of neon and argon provided crucial evidence that challenged the law of octaves, which suggested that elements could be arranged in a sequence based on their atomic weights, with similar properties repeating every eight elements. Noble gases like neon and argon, which did not fit into the established groups of elements, highlighted the limitations of this law and indicated the need for a more comprehensive understanding of periodicity. This ultimately contributed to the development of the modern Periodic Table, which organizes elements based on atomic number and incorporates the noble gases as a distinct group.

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