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 Although the Law of Octaves represented an important initial effort to categorize elements, it was eventually superseded by Dmitri Mendeleev's more comprehensive periodic table.
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Question : In which year did AEB de Chancourtois organise the elements by atomic weight by graphing the elements around a cylinder with a circumference of 16 units, corresponding to the weight of oxygen (O)?
Question : Identify the correct statement about Newlands' law of octaves.
Question : When did Dmitri Mendeleev invent the periodic table, ordering the symbols of the chemical elements according to their atomic weights?
Question : What is the common characteristic of the elements of the same group in the periodic table?
Question : Which of the following are members of 15 naturally occurring metallic chemical elements whose atomic numbers are between 57 and 71?
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