Elements a b c occur as dobereiner triads . If the atomic mass of a is 7 and that of c is 39
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Answer:
the atomic mass of b is 23
explanation :
according to dobereiner,
atomic mass of middle element is nearly equal to the average atomic weight of first and third element i.e
at mass of b = 7 +39/2 = 23
bonus : the elements are Li , Na , K
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