Question

Let's say 3 elements a b c from a triad the atomic mass of the first two elements a and b is 40 and 88 find the atomic mass of the 3rd element c

Answer 1

Answer:  136

Explanation:

According to Dobreiner's triad, the atomic mass of the central element (B) is the arithmetic mean of the atomic masses of the other two elements (A and C ).

Given: a=40 , b=88

Let the mass of C be $M_c$

$88= \frac{40+M_c}{2}$

$M_c$ = 176 - 40 = 136

The atomic mass of the 3rd element c is 136.