Question

Lithium Sodium and potassium from a dobereiners . the atomic masses of sodium and potassium are 23 and 39 respectively. predict the atomic mass of lithium

Answer 1

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.

A.Let us take example of three elements (triads): Lithium, Sodium and Pottasium

Atomic mass of lithium = 7
Atomic mass of Potassium = 39
 
Sum of the atomic masses of lithium and potassium = 7 + 39 = 46
Average of their atomic masses =
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Answer 2

Hey mate here is your answer


Atomic mass of Na=7+39/2=46/2=23

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