All the elements, on the basis of long form of periodic table, can be divided into four blocks, s,p, d and f. the ionization energies, electron affinities, electronegativities, atomic and ionic radii and other physical properties usually shown a regular pattern of change within a group or along period with some irregularities.
Q. On moving from Li to F in the second period, there would be a decrease in :

Options

A. non-metallic property
B. atomic radius
C. ionization potential
D. electronegativity

Answer

To solve the question regarding the changes in properties as we move from lithium (Li) to fluorine (F) in the second period of the periodic table, we will analyze the properties mentioned: atomic radii, ionization potential, electronegativity, and nonmetallic character.

### Step-by-Step Solution:

1. **Identify the Elements in the Second Period**:
- The elements in the second period are: Li, Be, B, C, N, O, F, and Ne.

2. **Understand the Trend in Atomic Radii**:
- As we move from left to right across a period, the nuclear charge increases because protons are added to the nucleus. This increased positive charge attracts the electrons more strongly, pulling them closer to the nucleus.
- Consequently, the atomic radii decrease from Li to F.

3. **Analyze Ionization Energy**:
- Ionization energy is the energy required to remove an electron from an atom. As we move from Li to F, the ionization energy increases due to the increased nuclear charge and the stronger attraction between the nucleus and the electrons.

4. **Examine Electronegativity**:
- Electronegativity is a measure of an atom's ability to attract and hold onto electrons. This property also increases from Li to F due to the increasing nuclear charge.

5. **Consider Nonmetallic Character**:
- Nonmetallic character increases as we move from metals (like Li and Be) to nonmetals (like F and Ne). Therefore, nonmetallic character increases rather than decreases.

6. **Conclusion**:
- The only property that shows a decrease when moving from Li to F is the atomic radii. Thus, the correct answer to the question is that there would be a decrease in atomic radii.

### Final Answer:
On moving from Li to F in the second period, there would be a decrease in **atomic radii**.