Question

what were the basis of dobereiner's triads

Answer 1

Döbereiner's triads were an early attempt to sort the elements into some logical order by their physical properties. In 1817, a letter reported Johann Wolfgang Döbereiner's observations of the alkaline earths; namely, that strontium had properties that were intermediate to those of calcium and barium.[1] By 1829, Döbereiner had found other groups of three elements (hence "triads") whose physical properties were similarly related.[2] He also noted that some quantifiable properties of elements (e.g. atomic weight and density) in a triad followed a trend whereby the value of the middle element in the triad would be exactly or nearly predicted by taking the arithmetic mean of values for that property of the other two elements.

Predicted vs actual atomic mass of the central atom of each triad

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