Question : In which year did John Alexander Newlands propound a new concept of the 'Law of Octaves' proposing the periodicity of chemical elements arranged in order of atomic weight?
Option 1: 1860
Option 2: 1865
Option 3: 1873
Option 4: 1870
Correct Answer: 1865
Solution : The correct option is 1865.
John Alexander Newlands proposed the "Law of Octaves" in 1865. According to the Law of Octaves, chemical elements display comparable properties after every eighth element when grouped in increasing atomic weight order.
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