Multiple choice

At which element did Newlands’ arrangement of elements end?

  1. Helium

  2. Selenium

  3. Tin

  4. Thorium

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Newlands, an English scientist, arranged the elements according to their increasing atomic masses. He started with hydrogen (Atomic mass = 1 u), the element having the least atomic mass and ended with thorium, which was the 56th element.