Question

state limitations of Dobereiners law of triads

Answer 1

First:
Doberenier could only find four triads at that time. All those elements could not be classified as Doberenier’s triads.

Second:
This was a major drawback of Doberenier’s triads. He stated that when three elements of same chemical properties were arranged in order of their increasing atomic masses, the sum of first and third element was rougly the average of the middle element.

But, three elements nitrogen, phosphorus and arsenic have same chemical properties, but these three elements do not follow Doberenier’s rule.
Atomic mass of nitrogen is 14 u and that of arsenic is 74.9 u but their average is 14+74.9/2= 44.45 u which is much higher than atomic mass of phosphorus i.e, 31 u.

So, Doberenier’s triads could not be used.

Hope it helps☺☺

Answer 2

hey

here is answer

Dobereiner's traids

when elements are arranged in order of increasing atomic masses group of three elements( known as traits) having similar chemical properties are obtained.

the atomic mass of middle element of traids is equal to the arithmetic mean of other two elements.

limitations.

1. it failed to arrange all the then known elements in the form of traids.

2. dobereiner's code identify only three traids from the then known elements

hope it helps

thanks