Which of the following is Dobereiner triad

  1. A

    Li, Na, K

  2. B

    Fe, Co, Ni

  3. C

    Ru, Rh, Pd

  4. D

    Os, Ir, Pt

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    Solution:

    The atomic weight of middle element of a triad was approximately the average of the atomic weights of the other two members. 

    Atomic weight  →Li=7 

    Atomic weight → Na=23 

    Atomic weight →K=39

    7+392=462

    =23

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