Question

X,Z,Y forms a Dobereiner traid. The atomic

mass of X and Z is found to be 35.5u and

81.2u respectively. The atomic mass of Y is


(1) 39.1
(2) 137.3

(3) 126.9
(4) 88.7​

Answer 1

Explanation:

For a dobernier triad, average of atomic mass of two extreme elements is equal to the atomic mass of middle element

Hence

X+Z =Y

2

Hence the correct option will be (3)