Question

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Write the limitations of these Dobereiners triads all

Answer 1

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⭐first
He could only find four traids at tha time.All those elements could not be classified as Doberenier's traids
⭐second
This was a major drawback of doberenier's traid.
he started that when 3 elements of same property were arranged in order of their increasing atomic mass that the sum of first nd third element was roughly the average of the middle element .But 3 elements nitrogen, phosphorus nd arsenic have same chemical properties but these 3 element don't follow doberenier traids
atomic mass of nitrogen is 14 u
nd arsenic is 74.9 but their average is 44.45 u which is much higher than atomic mass of phosphorus I.e.31 u

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