Who arranged the 56 elements in an ascending order of their atomic mass and found that each 8th element had the same properties?

Correct option is D

The correct answer is (d) John Newlands
· John Newlands, an English chemist, proposed the Law of Octaves in 1865.
· He arranged the then-known 56 elements in increasing order of atomic mass.
· He found that every 8th element showed similar properties, like the musical octave.
· It was the first attempt to classify elements periodically.
· His work paved the way for later developments like Mendeleev’s Periodic Table.
· Though initially ridiculed, his ideas were later appreciated.
Information Booster:
• Law of Octaves was valid only up to Calcium.
• The idea introduced the concept of periodicity.
• Newlands' classification lacked space for future elements.
• Helped establish the foundation for modern periodic law.
• He was honored posthumously by the Royal Society of Chemistry.
• Preceded Mendeleev’s 1869 periodic table.
Additional Information:
• Dmitri Mendeleev – Developed the Periodic Table (1869) based on atomic mass.
• Van Spronsen – Historian, not a chemist.
• Lothar Meyer – German chemist who also worked on periodic classification.