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NEETChemistryClassification of Elements and Periodicity in Properties

Identify which of the following is a Dobereiner’s Triad.

Options

  1. ALi Na K
  2. BMg Ca Sr
  3. CAl Ga In
  4. DAll of the above

Correct answer

A. Li Na K

Step-by-step solution

In a Triad, the middle element of each of the Triads had an atomic weight about half way between the atomic weights of the other two. Atomic weights of lithium, sodium and potassium are 7, 23 and 39 respectively.

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