Question

In Dobereiner's triads Li, Na, K, the atomic masses of
Lithium and Potassium are 6.9 and 39.1 respectively, then
what will be the atomic mass of sodium.​

Answer 1

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Ques: In Dobereiner's triads Li, Na, K, the atomic masses of

Lithium and Potassium are 6.9 and 39.1 respectively, then

what will be the atomic mass of sodium.

Ans: In a traid,the mass of theiddle element is equal to the approx average of 1st and the 3rd element.

Hence, (Li)u + (K)u = $\frac{approx value of (Na)u}{2}$.

6.9+39.1 = $\frac{46}{2}$

The approx value of Sodium's mass is 23.

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