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Question

In Dobereiner classification of elements, the atomic weight of the middle element is equal to the ________ of the extreme elements of a triad.


A
sum
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B
average
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C
difference
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D
fraction
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Solution

The correct option is B average
In Dobernier classification of elements, the atomic weight of the middle element is equal to the average of the extreme elements atomic weight of a triad.
Example          Atomic weight
Lithium---------        7
Sodium---------     23
Potassium-------    39
Average of atomic weights of lithium and 
 Potassium = $$\dfrac{7+39}{2} = \dfrac {46}{2}$$  =23
23 is the atomic weight of sodium.

Chemistry

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