Dobereiner's Law of Traids

Q. Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.

Q. The atomic masses of X and Z are 20 u and 40 u, respectively. If X, Y and Z form a Döbereiner’s triad, what should be the atomic mass of Y?

1. 30 u
2. 40 u
3. 20 u
4. 50 u

Q.

What is the basis of the Dobereniers triad explain?

Q. Identify the third element of the following Döbereiner's triads.

1. Potassium
2. Barium
3. Iodine

Q. Lithium, sodium and potassium form a Dobereiner’s triad. The atomic masses of lithium and potassium are 7 and 39 respectively. Predict the atomic mass of sodium.