Nucleophiles are Lewis .......... and possess .......... pair of electrons.

Explanation

To solve the question "Nucleophiles are Lewis .......... and possess .......... pair of electrons," we need to fill in the blanks based on our understanding of nucleophiles and Lewis theory.

### Step-by-Step Solution:

1. **Understanding Lewis Theory**:
- Lewis theory defines acids and bases in terms of electron pairs. A Lewis acid is an electron pair acceptor, while a Lewis base is an electron pair donor.

2. **Defining Nucleophiles**:
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