Which of the following is not a Doebereiner triad-

Li, Na, K

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Mg, Ca, Sr

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Cl, Br, I

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S, Se, Te

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Solution

The correct option is B
Mg, Ca, Sr

According to Doebereiner's law of triads, in a group of 3 elements with similar properties the atomic weight of the middle element was the arthimetic mean of the other two

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Similar questions

[Given: Atomic mass of elements : L i = 6.9, N = 14, N a = 23, P = 31, C l = 35, K = 39 C a = 40, A s = 74.9, B r = 79.9, S r = 87.6, I = 126.9, B a = 137.3]

Identify the missing elements from the following Dobereiner's triads.

I

A l > S i > P > C l

I I

B e < M g < C a < S r

I I I

I < B r < C l < F

I V

{N a}^{+} < {M g}^{2 +} < {A l}^{3 +} < {S i}^{4 +}

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