Question

Give one Dobereiner's triad?
Give 1 mark answer

Answer 1

Answer: Lithium , Sodium and Potassium..

Explanation: The atomic mass of Sodium is the arithmetic mean of atomic masses of Lithium and Potassium...

Atm. Mass of Na = 22.9 u

Atm. Mass of Li = 6.941 u

Atm. Mass of K = 39.09 u

(39.09 + 6.94) ÷ 2 = 23 (appx.)

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Answer 2

Answer:

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. ... All the known elements could not be arranged in the form of triads.