Which molecule has a lone pair on the central atom and a pyramidal shape?
Answer and explanation
Correct answer: A.
- Step 1: In ammonia (), the central nitrogen atom has valence electrons, forming single bonds with hydrogen atoms and retaining lone pair.
- Step 2: With bonding pairs and lone pair, the steric number is , producing an tetrahedral electron-pair geometry.
- Step 3: The lone pair exerts extra repulsion on the bonding pairs, giving the molecule a trigonal pyramidal shape.
Answer
.
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