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Question
In Dobereiner's triads, when 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. Identify ‘X’ from the given triad.
Li (6.9), Na (X), K (39.0).
In Dobereiner's triads, when 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. Identify ‘X’ from the given triad.
Li (6.9), Na (X), K (39.0).
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Solution
The correct option is B 23.0
Given Li (6.9), Na (X), K (39.0)
Applying the property of Dobernier's triads for the above triad-
(6.9+39.0)2 ≈ 23.0 = X
⟹X=23
Given Li (6.9), Na (X), K (39.0)
Applying the property of Dobernier's triads for the above triad-
(6.9+39.0)2 ≈ 23.0 = X
⟹X=23
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