Question

X Y and Z are the elements of a dobereiner's triads . if the atomic mass of X is 7 and that of z is 39 . what should be the atomuc mass of Y​

Answer 1

Answer:

23 is the answer

Explanation:

Because atomic mass of middle element is almost equal to average of atomic masses of other two elements.

Answer 2

Answer:

Mass of Y will be the mean mass of X & Z

So mass of Y = 23u