Highest amount of energy will be required for the removal of electron from

Options

A. 1.s-subshell
B. 2. p-subshell
C. 3. d-subshell
D. 4. f-subshell

Answer

To determine which subshell requires the highest amount of energy for the removal of an electron, we can analyze the position of various subshells in relation to the nucleus and the effective nuclear charge experienced by the electrons in those subshells.

### Step-by-Step Solution:

1. **Identify the Subshells**: The subshells we are considering are S, P, D, and F. Each of these subshells has a different distance from the nucleus and experiences different levels of attraction due to the nucleus.

2. **Understand the Position of Subshells**: The order of subshells based on their distance from the nucleus is as follows:
- S subshell (closest to nucleus)
- P subshell
- D subshell
- F subshell (farthest from nucleus)

3. **Analyze Electron Attraction**: Electrons in subshells that are closer to the nucleus (like S) experience a stronger attraction to the positively charged nucleus compared to those in subshells that are farther away (like F).

4. **Energy Required for Electron Removal**: When removing an electron, the energy required is directly related to how strongly that electron is held by the nucleus. Electrons in the S subshell are held more tightly due to their proximity to the nucleus, thus requiring more energy to remove them compared to electrons in P, D, or F subshells.

5. **Conclusion**: Therefore, the highest amount of energy will be required for the removal of an electron from the S subshell.

### Final Answer:
The highest amount of energy will be required for the removal of an electron from the **S subshell**.