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

Options

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

Explanation

To determine which groups of the periodic table do not form hydrides, we can follow these steps:

### Step 1: Understand what hydrides are
Hydrides are compounds formed between hydrogen and other elements. They can be ionic or covalent and are typically formed with elements from various groups in the periodic table.

**Hint:** Remember that hydrides are formed when hydrogen bonds with other elements, particularly from the p-block of the periodic table.

### Step 2: Identify the groups mentioned in the question
The groups given in the question are:
- Group 7
- Group 8
- Group 9
- Group 13
- Group 14
- Group 15
- Group 16
- Group 17

**Hint:** Familiarize yourself with the elements in each group to understand their properties and whether they can form hydrides.

### Step 3: Analyze the groups that typically form hydrides
- **Group 13 (Boron family)**: Elements like boron can form hydrides (e.g., diborane, B2H6).
- **Group 14 (Carbon family)**: Carbon forms hydrides (e.g., methane, CH4).
- **Group 15 (Nitrogen family)**: Nitrogen forms hydrides (e.g., ammonia, NH3).
- **Group 16 (Oxygen family)**: Oxygen forms hydrides (e.g., water, H2O).
- **Group 17 (Halogens)**: Fluorine forms hydrides (e.g., HF).

**Hint:** Groups 13 to 17 are known for forming various hydrides due to their ability to bond with hydrogen.

### Step 4: Identify groups that do not form hydrides
- **Group 7 (Transition metals)**: Elements like manganese do not form stable hydrides.
- **Group 8 (Noble gases)**: Noble gases do not form hydrides due to their complete valence shell.
- **Group 9 (Transition metals)**: Elements like cobalt and nickel also do not form stable hydrides.

**Hint:** Transition metals and noble gases typically do not form hydrides due to their electronic configurations.

### Step 5: Conclusion
From the analysis, we conclude that the groups that do not form hydrides are:
- Group 7
- Group 8
- Group 9

Thus, the answer to the question is that elements of groups 7, 8, and 9 do not form hydrides.

**Final Answer:** Group 7, 8, and 9 do not form hydrides.