The electronic configuration of Halogens in their valence shell is

Options

A. `ns^(2)`
B. `ns^(2)np^(5)`
C. `ns^(2)np^(4)`
D. `ns^(2)np^(6)`

Explanation

To determine the electronic configuration of halogens in their valence shell, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Group of Halogens**:
- Halogens belong to Group 17 (or Group VIIA) of the periodic table. The elements in this group include Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).

2. **Determine the Atomic Numbers**:
- Fluorine (F) has an atomic number of 9.
- Chlorine (Cl) has an atomic number of 17.
- Bromine (Br) has an atomic number of 35.
- Iodine (I) has an atomic number of 53.

3. **Write the Electronic Configuration for Each Halogen**:
- For Fluorine (F):
- The electronic configuration is 1s² 2s² 2p⁵.
- The valence shell (n=2) configuration is 2s² 2p⁵.
- For Chlorine (Cl):
- The electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁵.
- The valence shell (n=3) configuration is 3s² 3p⁵.
- For Bromine (Br):
- The electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁵.
- The valence shell (n=4) configuration is 4s² 4p⁵.
- For Iodine (I):
- The electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 4p⁶ 5s² 5p⁵.
- The valence shell (n=5) configuration is 5s² 5p⁵.

4. **Generalize the Valence Shell Configuration**:
- From the configurations above, we can see a pattern. The valence shell electronic configuration for all halogens can be generalized as:
- ns² np⁵
- Here, 'n' represents the principal quantum number corresponding to the period of the element.

5. **Conclusion**:
- Therefore, the electronic configuration of halogens in their valence shell is represented as **ns² np⁵**.