Arrange the following elements in increasing order of their atomic radii.
Li, Be, F, N

Explanation

To arrange the elements Li (Lithium), Be (Beryllium), F (Fluorine), and N (Nitrogen) in increasing order of their atomic radii, we need to understand how atomic radii vary across a period in the periodic table.

### Step-by-Step Solution:

1. **Identify the Period**:
All the elements given (Li, Be, F, N) are in the second period of the periodic table.

2. **Understand Atomic Radii Trend**:
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