Chemistry

Question Analysis
This question involves VSEPR theory and comparing bond angles produced by different molecular geometries and lone pair effects.

Key Concept Explanation
A bond angle is the angle between two adjacent bonding electron domains around a central atom. Bond angles are primarily determined by the number of electron domains around the central atom, and deviations mainly occur when lone pairs are present.

Step-by-step Solution
1. BeF₂
Electron domains = 2 (Be forms 2 single bonds with F atoms and has 0 lone pairs) → Geometry = linear → Bond angle: 180°
2. CH₄
Electron domains = 4 (C forms 4 single bonds with H atoms and has 0 lone pairs) → Geometry = tetrahedral → Bond angle: 109.5°
3. SO₃
Electron domains ...