explain the limitations of law
of Dobereiner's triads.
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Answer:
Two important limitations are:
All known elements could not be classified into groups of triads on the basis of their properties .
Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.
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Limitations of Dobereiner's triads:
- He could classify the elements only into 3 triads.
- He was not able to prepare triads for all known elements which were present at that time.
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Characteristics of Dobereiner's triads:
- Elements which had similar chemical properties were placed in the same group.
- He arranged elements on the basis of their increasing order of atomic masses.
- He arranged elements such that the sum of atomic masses of first and last elements was approximately the average of middle element.
Example:
Lithium → 7
Sodium → 23
Potassium → 39
Atomic mass of Sodium = (7 + 23) ÷ 2 which is approximately equal to 23.
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