Question

Li,Na,k
Ru Rh Pd and Os,Ir,Pd and
Fe,Co,N
which of the following
Is Dobereiner
triod​

Answer 1

Answer:

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Answer 2

Answer:

(a) Li, Na, K

Explanation:

Döbereiner triad states that for a set of 3 elements when the three elements in a  triad are written in the order of increasing atomic masses; the atomic  mass of the middle element is roughly the average of the atomic masses  of the other two elements.

That is, $\frac{(Atomic mass of first element + Atomic mass of third element) }{2} = Atomic mass of second element$Verification:

(a) Li, Na, K

Atomic mass of:

• Li = 7
• Na = 23
• K = 39

∴ $\frac{7 + 39}{2}$ = $\frac{46}{2}$ = 23

Now, 23 = Atomic mass of Na, i.e. the second element

Thus, Li, Na, K form a Döbereiner triad

Once you have got the answer, there's no need to solve for the other parts.

Hope you got that.

Thank You.