UncategorizedAmong the following which one is not a Dobereiner’s triad

Among the following which one is not a Dobereiner’s triad

A
Li, Na, K
B
Cl, Br, I
C
F, Cl, Br
D
Ca, Sr, Ba

Solution:

The arithmetic mean of atomic mass of F and Br is not equal to Cl. Whereas the other three follow this rule and are Dobereiner's triad.

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