Question : In which year did John Newlands propound the 'Law of Octaves', an innovative concept proposing the periodicity of chemical elements arranged in the order of atomic weight?
Option 1: 1861
Option 2: 1863
Option 3: 1865
Option 4: 1867
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Correct Answer: 1865
Solution : The correct option is 1865.
John Newlands introduced the "Law of Octaves" in 1865, which he formulated after noticing that when elements were arranged in ascending order of their atomic weights, every eighth element exhibited similar properties. This parallelism led him to draw an analogy with musical octaves, where every eighth note produces a similar sound. Although the Law of Octaves represented an important initial effort to categorize elements, it was eventually superseded by Dmitri Mendeleev's more comprehensive periodic table.
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