Hydrogen accepts an electron to form inert gas configuration. In this it resembles

Options

A. Halogens
B. Alkali metals
C. Transition metals
D. Chalcogens

Answer

To solve the question, we need to determine which group of elements resembles hydrogen when it accepts an electron to achieve an inert gas configuration. Let's break down the steps:

### Step-by-Step Solution:

1. **Understand Hydrogen's Electron Configuration**:
- Hydrogen (H) has an atomic number of 1, with an electron configuration of \(1s^1\).
- When hydrogen accepts an electron, it becomes \(H^-\) (hydride) with an electron configuration of \(1s^2\).
- This configuration is the same as that of helium (He), which is an inert gas.

2. **Identify the Options**:
- The options given are:
1. Halogens
2. Alkali Metals
3. Transition Metals
4. Chalcogens

3. **Analyze Each Option**:
- **Option 1: Halogens**:
- General configuration: \(ns^2np^5\).
- When halogens gain one electron, their configuration becomes \(ns^2np^6\), which is the configuration of the next inert gas (group 18).
- Conclusion: Halogens do resemble hydrogen when they gain an electron.

- **Option 2: Alkali Metals**:
- General configuration: \(ns^1\).
- When alkali metals gain one electron, their configuration becomes \(ns^2\), which corresponds to group 2, not group 18.
- Conclusion: Alkali metals do not resemble hydrogen in this context.

- **Option 3: Transition Metals**:
- Transition metals have varying configurations, typically between groups 3 to 12.
- Gaining one electron does not lead to an inert gas configuration.
- Conclusion: Transition metals do not resemble hydrogen.

- **Option 4: Chalcogens**:
- General configuration: \(ns^2np^4\).
- When chalcogens gain one electron, their configuration becomes \(ns^2np^5\), which corresponds to group 17, not group 18.
- Conclusion: Chalcogens do not resemble hydrogen.

4. **Final Conclusion**:
- The only group that resembles hydrogen when it accepts an electron to achieve an inert gas configuration is the halogens.

### Answer:
The correct option is **Halogens**.