Due to the presence of lone pairs, which increase the bond pairs' repulsion and lead them to move closer to one another, the bond angle decreases.
Briefing:
With an increase in the core atom's electronegativity, the bond angle increases due to an increase in the repulsion between electron pairs.
Electrostatic repulsions are more significant for lone pairs than for bonded pairs because they take up more space around the centre atom.
Molecular Bonds
Bonding electrons are collectively referred to as the electrons that are present between the two nuclei. The "glue" that holds the atoms in molecular units together is the bound pair. The simplest substance with a covalent bond is the hydrogen molecule.
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