Question:

### Dobreiners work led to the law of triad which states that

A:
Atomic weight of any one element was found to be approximately the mean of the other two Elements of triad

B:
Atomic weight of the middle element was found to be approximately the mean of the other two Elements of a triad

C:
Atomic number of any one element was found to be approximately the mean of the other two Elements of a triad

D:
Atomic number of the middle element was found to be approximately the mean of the other two Elements of triad

Answer: B