Correct atomic size is :-

Options

A. `Li gt I gt F lt Cl lt Br`
B. `I gt Li gt F lt Cl gt Br`
C. `I gt Br gt Cl gt F gt Li`
D. `Li gt F lt I lt Br`

Answer

To determine the correct order of atomic sizes among the elements given in the question, we need to understand the trends in atomic size in the periodic table. Here’s a step-by-step solution:

### Step 1: Understand Atomic Size Trends
Atomic size generally increases as you move down a group in the periodic table due to the addition of electron shells. Conversely, atomic size decreases as you move from left to right across a period due to the increasing nuclear charge, which pulls the electrons closer to the nucleus.

**Hint:** Remember that atomic size increases down a group and decreases across a period.

### Step 2: Analyze the Elements
We are comparing lithium (Li), iodine (I), fluorine (F), chlorine (Cl), and bromine (Br).

- **Lithium (Li)** is in Group 1 and has a small atomic size due to its position at the top of the group.
- **Fluorine (F)** is in Group 17 and is smaller than lithium because it is further right in the periodic table.
- **Chlorine (Cl)** is also in Group 17 but is below fluorine, so it is larger than fluorine.
- **Bromine (Br)** is below chlorine in Group 17, making it larger than chlorine.
- **Iodine (I)** is further down in Group 17, making it the largest among the halogens listed.

**Hint:** Identify the group and period of each element to determine their relative sizes.

### Step 3: Compare the Elements
Now, we can arrange the elements based on the trends we established:
- Iodine (I) > Bromine (Br) > Chlorine (Cl) > Fluorine (F) > Lithium (Li)

This means that the correct order of atomic sizes from largest to smallest is:
1. Iodine (I)
2. Bromine (Br)
3. Chlorine (Cl)
4. Fluorine (F)
5. Lithium (Li)

**Hint:** Write down the elements in order from largest to smallest based on the trends you analyzed.

### Step 4: Evaluate the Options
Now we can evaluate the options provided in the question:
1. Li > I > F > Cl > Br (Incorrect)
2. I > Li > F > Cl > Br (Incorrect)
3. I > Br > Cl > F > Li (Correct)
4. Li > F < I > Br (Incorrect)

The only correct option based on our analysis is option 3: I > Br > Cl > F > Li.

**Hint:** Cross-check your findings with the options to confirm which one matches your order.

### Final Answer
The correct order of atomic sizes is:
**Iodine (I) > Bromine (Br) > Chlorine (Cl) > Fluorine (F) > Lithium (Li)**