Multiple choice

Which one of the following groups {set of elements} satisfies Dobereiners law?

  1. N , O , C

  2. Ca , Ba, Sr

  3. H , He, Li

  4. Ca, Sr , Ba

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

as per dobereiners law ,  the middle element should be the average of the other two elements

therefore Ca, Sr , Ba is the proper set of elements which satisfy dobereiners law