In the long form of periodic table elements with low ionisation potential are present in

Options

A. I A group
B. IV B group
C. VII A group
D. I B group

Answer

To answer the question about where elements with low ionization potential are found in the long form of the periodic table, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ionization Potential**:
- Ionization potential (or ionization energy) is the energy required to remove an electron from an atom in its gaseous state. Elements with low ionization potential can easily lose electrons.

2. **Periodic Trends**:
- As we move across a period (from left to right) in the periodic table, the ionization potential generally increases. This is due to the increase in effective nuclear charge, which pulls electrons closer to the nucleus, making them harder to remove.
- Conversely, as we move down a group (top to bottom), the ionization potential decreases. This is because the number of electron shells increases, which means the outermost electrons are further from the nucleus and experience less attraction, making them easier to remove.

3. **Identifying Groups with Low Ionization Potential**:
- The elements with the lowest ionization potential are typically found in Group 1 of the periodic table, which includes alkali metals such as lithium (Li), sodium (Na), potassium (K), and rubidium (Rb).
- These elements have only one electron in their outermost shell, which they can lose easily, resulting in low ionization energies.

4. **Conclusion**:
- Therefore, elements with low ionization potential are primarily found in Group 1 (alkali metals) of the long form of the periodic table.

### Final Answer:
Elements with low ionization potential are present in Group 1 of the long form of the periodic table.

---