Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE

The bond angles in tetrahedral \( \text{CH}_4 \), pyramidal \( \text{NH}_3 \), and bent \( \text{H}_2\text{O} \) are \( 109.5^\circ \), \( 107.0^\circ \), and \( 104.5^\circ \) respectively. By how much does each successive addition of one lone pair decrease the bond angle?

1. \( 1.5^\circ \)
2. \( 2.0^\circ \)
3. \( 3.0^\circ \)
4. \( 2.5^\circ \)