Elements of which of the following group(s) of periodic table do not form hydrides?

Options

A. Groups 7,8,9
B. Group 13
C. Groups 15, 16, 17
D. Group 14

Explanation

To determine which groups of the periodic table do not form hydrides, we can analyze the properties of the elements in each group.

### Step-by-Step Solution:

1. **Identify the Groups**: The question provides several groups from the periodic table:
- Group 7 (Halogens)
- Group 8 (Noble Gases)
- Group 9 (Transition Metals)
- Group 13 (Boron Family)
- Group 14 (Carbon Family)
- Group 15 (Nitrogen Family)
- Group 16 (Oxygen Family)
- Group 17 (Halogens)

2. **Understand Hydride Formation**: Hydrides are compounds formed when hydrogen combines with other elements. Not all elements can form stable hydrides.

3. **Analyze Each Group**:
- **Group 7 (Halogens)**: Elements like fluorine (F) and chlorine (Cl) can form hydrides (e.g., HF, HCl).
- **Group 8 (Noble Gases)**: Noble gases (e.g., He, Ne, Ar) do not typically form hydrides due to their complete valence shell.
- **Group 9 (Transition Metals)**: Elements like cobalt (Co) and rhodium (Rh) do not form stable hydrides.
- **Group 13 (Boron Family)**: Boron can form hydrides (e.g., B2H6).
- **Group 14 (Carbon Family)**: Carbon forms many hydrides (e.g., CH4).
- **Group 15 (Nitrogen Family)**: Nitrogen forms hydrides (e.g., NH3).
- **Group 16 (Oxygen Family)**: Oxygen forms hydrides (e.g., H2O).
- **Group 17 (Halogens)**: As mentioned, halogens can form hydrides.

4. **Conclusion**: The groups that do not form hydrides are Group 8 (Noble Gases) and Group 9 (Transition Metals). However, since the question asks for groups that do not form hydrides, we focus on the groups listed in the options.

5. **Final Answer**: The correct answer is **Group 7, 8, and 9** do not form hydrides.