Nucleophile Posted on 9th December 201515th May 2021 by ThePD (The Project Definition) Nucleophile is a chemical species of an atom or molecule that donates an electron pair to form a covalent bond in relation to a reaction. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in Science and tagged chemistry. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.