\( \mathrm{Li}, \mathrm{Na} \) and \( \mathrm{K} \) form a Dobereiners triad. The atomic masses ...

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\( \mathrm{Li}, \mathrm{Na} \) and \( \mathrm{K} \) form a Dobereiners triad. The atomic masses of \( \mathrm{Li} \) and \( \mathrm{K} \) are given as 7 and 39 respectively.
Determine the atomic mass of sodium.
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