The electronic configuration with the highest ionization enthalpy 'A' and 'B' :

Options

A. `[Ar]3d^(10)4s^(2)4p^(3)`
B. `[Ne]3s^(2)3p^(1)`
C. `[Ne]3s^(2)3p^(2)`
D. `[Ne]3s^(2)3p^(3)`

Answer

To determine the electronic configurations with the highest ionization enthalpy, we need to consider the stability of electronic configurations and the factors affecting ionization energy.

### Step-by-Step Solution:

1. **Understanding Ionization Enthalpy**:
- Ionization enthalpy is the energy required to remove an electron from an atom in its gaseous state. Higher ionization enthalpy indicates that it is more difficult to remove an electron.

2. **Stability of Electronic Configurations**:
- Electronic configurations that are half-filled or fully filled are generally more stable due to symmetrical distribution of electrons and exchange energy. This stability affects the ionization enthalpy.

3. **Identifying Half-Filled Configurations**:
- Half-filled configurations are those where orbitals are filled with an equal number of electrons. For example, configurations like \( p^3 \) (e.g., Nitrogen) or \( d^5 \) (e.g., Manganese) are half-filled.

4. **Comparing Periods**:
- Ionization energy generally increases across a period (from left to right) and decreases down a group (from top to bottom) in the periodic table. This is due to the increase in nuclear charge and the increase in atomic size.

5. **Analyzing Given Options**:
- If we have options A and B, we need to check their electronic configurations. If both configurations are half-filled, we compare their periods.
- For example, if option A is from the third period and option B is from the fourth period, option A will have a higher ionization enthalpy because it is smaller in size and has a higher effective nuclear charge.

6. **Conclusion**:
- The electronic configuration with the highest ionization enthalpy is the one that is either fully filled or half-filled and is from a higher period (if comparing half-filled configurations).

### Final Answer:
- The electronic configurations with the highest ionization enthalpy are likely to be those that are half-filled or fully filled, with preference given to those in the higher periods due to their stability.