Question

Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium

and sodium are 7 and 23 respectively. Predict the atomic mass of potassium.
Class 10 Chemistry​

Answer 1

Explanation:

39 is the atomic mass of POTASSIUM

Answer 2

Answer:

Dobereiner's triad = atomic mass of 1 st element + atomic mass of 3rd element/2

Total mass of Li + Na + K = 69

Atomic Mass of (Li + Na) = 7+23 = 30

Atomic Mass of K = 69-30 = 39

Therefore atomic mass of Potassium is 39