Question

Three elements P,Q,R form a Dobereiner triad. the atomic weights of Pand R 35 and 127 respectively. find the atomic weight of Q?

Answer 1

Answer:

81

Explanation:

Atomic weight of Q =

(35+127)/2

=162/2

=81

According to Dobereiners triads, the average of atomic masses of the first and last elements is approximately the atomic mass of the second element

Answer 2

Given: Three elements P, Q, R form a Dobereiner triad. the atomic weights of P and R 35 and 127.

To find: We have to find the atomic weight of Q.

Solution:

For the Dobereiner triad, the atomic weight of the middle element is the average of the other two elements.

The atomic weight of P and R is 35 and 127.

Thus, the atomic weight of Q will be the average of P and R.

Thus, the atomic weight of Q is-

$\frac{35 + 127}{2} \\ \frac{162}{2} = 81$

The atomic weight of Q is 81.