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lone pair
This term is a specialized technical expression used almost exclusively within the fields of chemistry and molecular physics. It describes a specific electronic configuration where two valence electrons remain associated with a single nucleus rather than participating in a chemical bond. This configuration is critical for determining the geometry and polarity of a molecule, as these electrons exert a repulsive force on bonding pairs.
Because it is a compound noun consisting of an adjective and a noun, it follows standard English pluralization rules. In academic writing, it is typically used in a descriptive sense to explain VSEPR theory or the hybridization of atoms.
Ý nghĩa
Ví dụ
The nitrogen atom in ammonia has one lone pair.
Does the central atom have a lone pair in this molecule?
The presence of a lone pair causes the molecule to have a bent shape.
I need to remember that the lone pair occupies more space than a bonding pair.
A lone pair of electrons can act as a nucleophile in organic reactions.
The lone pair on the oxygen atom makes water a polar solvent.
Wait, if there is a lone pair here, the bond angle should be smaller.
The VSEPR theory explains how the lone pair repels the bonding pairs.