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The three elements A, B and C with simil...

The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. This mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as ? Give on example of such a set of elements.

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**Step-by-Step Solution:** 1. **Understanding the Problem:** - We have three elements A, B, and C with atomic masses X, Y, and Z respectively. - The problem states that the atomic mass of element B (Y) is approximately equal to the average of the atomic masses of elements A (X) and C (Z). 2. **Defining the Average:** - The average of two numbers X and Z can be calculated using the formula: ...
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