Nucleophilicities

Part of speech: noun

Definitions

1. The ability of a chemical species to donate an electron pair to form a chemical bond with a deficit electron site is described as reactivity in nucleophiles
2. A measure of how readily a species with an electron pair engages in bond formation by interacting with electrophiles is known as nucleophilic reactivity
3. The tendency of an electron-rich molecule to seek out and bond with positively charged or electron-deficient atoms or regions is defined as its nucleophilic activity

Etymology: "Nucleophilicities" is the plural of "nucleophilicity", a term for how readily a chemical species donates an electron pair to form a new bond. Its core is "nucleophilic", built from "nucleus" and the Greek-derived "-philic", "loving", so a nucleophile is a species that seeks out positively charged, electron-poor centres. Adding the suffix "-ity", which turns an adjective into an abstract noun of quality, gives the idea of the degree of that tendency. The suffix has a longer ancestry than the chemistry. "-ity" descends from Latin "-itas", which passed into English through Old French "-ite" and Middle English "-ite" before settling as "-ity". Its job is simply to name a quality, so "nucleophilicity" is a modern technical coinage built on that old machinery rather than an inherited word.