Question

Using atomic masses of Li,Na and K, find the average atomic mass of Li, and K and compare it with the atomic mass of Na. State the conclusion drawn from this activity

Answer 1

The conclusion was that it satisfied the Dobenier's law of traids.

Answer 2

Atomic mass of Li: 6.9
Atomic mass of Na: 23
Atomic mass of K: 39.1

Atomic mass of Na = Atomic mass of Li+
Atomic mass of K/2

23 = 6.9+39.1/2
23 = 46/2
So, 23 = 23

Hence, atomic mass of Na was same as the average of atomic masses Li and K.
This was what stated bt Döbereiner's. This was included in Döbereiner's Triads.


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