The group of elements responsible for hydride gap

Options

A. Mn, Ca, Ni
B. Mn, Fe, Li
C. Mn, Fe, Co
D. Mn, Cu, Cl

Answer

To determine the group of elements responsible for the hydride gap, we need to analyze the groups in the periodic table that do not form hydrides.

### Step-by-Step Solution:

1. **Understanding the Hydride Gap**:
- The hydride gap refers to the absence of stable hydrides formed by certain groups of elements in the periodic table. Specifically, this gap is observed in groups 7, 8, and 9.

2. **Identifying the Groups**:
- Group 7: Transition metals, including manganese (Mn).
- Group 8: Transition metals, including iron (Fe).
- Group 9: Transition metals, including cobalt (Co).

3. **Reason for the Hydride Gap**:
- Elements in groups 7, 8, and 9 have a low affinity for hydrogen in their normal oxidation states, which is why they do not form stable hydrides.

4. **Analyzing the Options**:
- Option 1: Mn (Manganese) - This is in group 7, which does not form hydrides. Therefore, this option is incorrect.
- Option 2: Ca (Calcium) - This is in group 2, which is not part of the hydride gap. Therefore, this option is also incorrect.
- Option 3: Ni (Nickel) - This is in group 10, which is outside the hydride gap. Therefore, this option is incorrect.
- Option 4: Cl (Chlorine) - This is in group 17, which is not part of the hydride gap. Therefore, this option is also incorrect.

5. **Conclusion**:
- The elements responsible for the hydride gap are the metals of groups 7, 8, and 9. Since none of the options provided (Mn, Ca, Ni, Cl) correctly represent a group that forms hydrides, we conclude that the question may be misleading or incorrectly framed.

### Final Answer:
The group of elements responsible for the hydride gap is groups 7, 8, and 9.