Lone pair of electrons are highly unstable and highly reactive and plays major role in the chemical bonding.
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If an atom has five valence electrons, it will have one lone pair of electrons.
Cl atom in HCl has three lone pairs of electrons.
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Lone pairs typically have the greater repulsion because lone pairs want to be as far apart from one another as possible, even more so than bonding pairs. This is because the lone pairs consist of free-moving electrons.
The lone pair electron region is the place around the central atom where electrons not bonding with another atom can be found. A lone pair of electrons are electrons that are not bonded with other atoms.