Step 1: Understand what a nucleophile is. A nucleophile is a species that donates an electron pair to form a chemical bond.
Step 2: Identify the characteristics of a strong nucleophile. Strong nucleophiles typically have a high electron density and are often negatively charged or have lone pairs of electrons.
Step 3: Look at the example given, which is ammonia (NH3).
Step 4: Check the structure of ammonia. It has a nitrogen atom with one lone pair of electrons.
Step 5: Recognize that the lone pair on nitrogen can be donated to form a bond, making ammonia a strong nucleophile.
