Question

DESCRIBE DOBERINEER TRAIDS?

Answer 1

In 1817,J.W.dobereiner a german chemist suggested a relationship between the properties of elements and their atomic weights.

A)He arranged elements with similar properties in the groups of three called triads.

B)According to Dobereiner,the atomic mass of the central elements was merely the arithemetic mean of atomic masses of the other two elements.

For e.g.

Li=7

NA=23

K=39

Atomic mass of sodium=Atomic mass of lithium + Atomic mass of potassium

2

=7+39=23

2