state dobereiner law
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Dobereiner's law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements. ... The atomic mass of lithium is 7 and the atomic mass of potassium is 39. The average of masses of lithium and potassium gives atomic mass of sodium 23.
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according this law elements were arranged in the group of triads according to their atomic masses
eg
li
na
k
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