Consider the following statements
I.First ionisation energy of group 2 elements is greater than the corresponding elements of group 13
II.it is always difficult to pull out electrons from stable configuration
Select the correct statement

Options

A. only I
B. Only II
C. I and II
D. none of these

Answer

To solve the question, we need to analyze both statements provided regarding the first ionization energy of Group 2 and Group 13 elements, as well as the concept of stable electron configurations.

### Step-by-Step Solution:

1. **Understanding Ionization Energy**:
- Ionization energy is defined as the minimum amount of energy required to remove an electron from an isolated gaseous atom.
- It is influenced by the effective nuclear charge (Z-effective) and the size of the atom.

2. **Comparing Group 2 and Group 13 Elements**:
- Group 2 elements (alkaline earth metals) have a general electron configuration ending in s² (e.g., Be: 1s² 2s²).
- Group 13 elements (e.g., B: 1s² 2s² 2p¹) have a partially filled p-orbital.
- As we move from Group 2 to Group 13, the atomic size tends to decrease, but the stability of the electron configuration plays a crucial role.

3. **Analyzing Statement I**:
- The statement claims that the first ionization energy of Group 2 elements is greater than that of Group 13 elements.
- However, due to the stable filled s² configuration in Group 2, it is actually harder to remove an electron compared to the p¹ electron in Group 13.
- Therefore, the first ionization energy of Group 2 elements is **greater** than that of Group 13 elements. **This statement is true.**

4. **Analyzing Statement II**:
- The second statement asserts that it is always difficult to pull out electrons from stable configurations.
- This is a general principle in chemistry: stable electron configurations (like filled s or p orbitals) require more energy to remove an electron.
- Thus, this statement is also **true**.

5. **Conclusion**:
- Both statements I and II are correct.
- Therefore, the correct answer is that both statements are true.

### Final Answer:
Both statements are correct.

---