Problems and exercisesMolecular Geometry

1. Predict the geometry

Predict the shape of each molecule from the electron pairs around the central atom:

1. CH₄
2. NH₃
3. H₂O
4. BF₃
5. CO₂

2. Angles

The H–O–H angle of water (104.5°) is smaller than the tetrahedral angle of methane (109.5°). Why?