First member of each group of representative elements (i.e., s and p-block elements) shows anomalous behaviour. Illustrate with two examples.

Explanation

To illustrate the anomalous behavior of the first member of each group of representative elements (s and p-block elements), we can consider two examples: Lithium (Li) and Beryllium (Be) from the s-block, and Fluorine (F) and Oxygen (O) from the p-block.

### Step-by-Step Solution:

1. **Identify the First Members of Each Group:**
- For the s-block elements, the first members are Lithium (Li) and Beryllium (Be).
- For the p-block elements, the first members are Boron (B), Carbon (C), Nitrogen (N), Oxygen (O), and Fluorine (F).

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