Question

Let’s consider elements X, Y, and Z form a Döbereiner’s triad. If the atomic masses of X and Y are 40 u and 87 u respectively. Find the approximate atomic mass of Z.

• A. 140 u
• B. 130 u
• C. 125 u
• D. 134 u

Answer 1

The correct option is D 134 u

Option 'c' is the correct answer.