is the element which is not present in any sets belonging to Dobereiner's Triads.

Lithium

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Potassium

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Sodium

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Neon

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Solution

The correct option is D Neon
According to Dobereiner, when the three elements in a triad are written in the increasing order of atomic masses, the atomic mass of the middle element is roughly the average of the atomic masses of the other two elements.

None of the sets of Dobereiner's Triads consist of inert gases. So, neon is the element which does not belong to any triad set.

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