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In dobereiner's triad containing Li, Na,...

In dobereiner's triad containing Li, Na, K, if atomic masses of lithium and potassium are 6.9 and 39.1 , then what will be the atomic mass of sodium ?

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The atomic mass of sodium is the average of the atomic masses of Li and K i.e, ` ( 6.9 + 39.1)/2 =23`
The atomic mass of sodium will be 23.
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