Multiple choice

How many elements have been classified in Newlands' octaves?

  1. 36

  2. 96

  3. 108

  4. 56
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

John Newlands arranged the then known elements in the increasing order of masses. He started with the element having the least atomic mass (hydrogen) and ended at thorium, which was the 56th element.

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