Question

The Triad is not present in the VIII group of Mendeleev periodic table
1) Li, Na, K
2) Fe, Co, Ni
3) Ru, Rh, Pd
4) Os, Ir, Pt
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Answer 1

Answer:

Li, Na, K

Explanation:

it is because they are not transition metal. the others have one element of the VIII group of Mendeleev periodic.

i hope it helps

Answer 2

Answer:

Option $2: Fe, Co, Ni$ is not a triad.

Explanation:

Since the middle element's atomic weight is different from the sum of the weights of the other two elements, it cannot be considered an equal weight. $Fe, Co,$ and $Ni$ are not a Doberiner triad as a result.

Johann Wolfgang Dobereiner, a German scientist, discovered Dobereiner's triads, which are collections of elements with related properties.

He noticed that groupings of three elements, known as triads, could be developed where each element had a similar set of physical and chemical characteristics.