Question

State Dobereiner law and explain it with any two examples.​

Answer 1

Answer:

He arranged the three elements in a triad in an increasing order of atomic mass and showed that the atomic mass of the middle element was approximately equal to the mean of the atomic masses of the other elements. Examples : Lithium (Li), Sodium (Na), Potassium (K) from Dobereiner's tried.

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Answer 2

Answer:

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When elements are arranged in order of increasing atomic masses, groups of three elements (triads), having similar chemical properties are obtained. The atomic mass of the middle elements of the triad being equal to the arithmetic mean of the atomic masses of the other two elements.

Example: Alkali metal group (Dobereiner's triad): Lithium is the 1st element, sodium is the middle element whereas potassium is the 3rd element of the triad.

Explanation:

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