Question

what is meant by dobernier traids​

Answer 1

Dobereiner's triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties.

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Answer 2

the average of first and third atomic masses of an element similar to the atomic mass of middle element is called as dobernier triad

Explanation:

for example:

li, na,k

mean=li+k/2

=6.9+39.1

=23.0

atomic mass of na=23