In graph of atomic volume versus atomic weight , the elements corresponding to peaks in the curve belong to

Options

A. Group 1
B. Group 18
C. Group 4
D. Group 14

Answer

To solve the question regarding the graph of atomic volume versus atomic weight and the elements corresponding to peaks in the curve, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Graph**:
- The graph in question is known as the Lothar-Meyer plot, which plots atomic volume on the y-axis against atomic weight on the x-axis.

2. **Identifying Peaks**:
- In the Lothar-Meyer plot, peaks correspond to elements that have similar properties and are typically found in the same group of the periodic table.

3. **Analyzing Group Positions**:
- Group 1 elements, known as alkali metals (lithium, sodium, potassium, rubidium, and cesium), are known to occupy the peaks in the atomic volume versus atomic weight graph. These elements have high atomic volumes due to their low densities and large atomic sizes.

4. **Comparing Other Groups**:
- Group 2 elements (alkaline earth metals) do not occupy the peaks but rather follow the peaks in the ascending part of the graph.
- Noble gases (Group 18), except for helium, occupy a descending position in the graph, indicating lower atomic volumes compared to the peaks.

5. **Conclusion**:
- Since the question asks for the elements corresponding to the peaks in the curve, we conclude that these elements belong to **Group 1**.

### Final Answer:
The elements corresponding to the peaks in the curve belong to **Group 1**.

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