Correct option is D
The correct answer is (d) He started with the element having the lowest atomic mass (hydrogen) and ended at thorium which was the 56th element.
• Newlands' law of octaves was proposed by John Newlands in 1864.
• He arranged elements in order of increasing atomic mass and observed that every eighth element had properties similar to the first, akin to musical octaves.
• Newlands' periodic table included elements from hydrogen to thorium, the 56th element.
• This early classification system helped in identifying patterns among elements, despite its limitations and initial resistance from the scientific community.