Question

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Answer 1

Explanation:

Dobereiner's law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements. Example:In the triad of lithium, sodium and potassium.

Atomic Mass Of Na..is 22.989769 u

Answer 2

Answer:

Dobereiner's law of triads:

When elements were arranged in order of increasing atomic masses, group of three elements (known as triads) , having similar properties are obtained.

The atomic mass of the middle elements of the triads was roughly the average of the atomic masses of the other two elements.

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There is a limitation too:

Only three triads were recognised from the elements known at that time.

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The atomic mass of Sodium (Na) is 23 according to Dobereiner's triad.

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