Electronegativity and Nucleophilocity

[wormboge]

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Why and how does electronegativity reduce nucleophilocity?

 

[pretty_positron]

The more electronegative the atom is the more it wants electrons, so it is electrophilic. This is the opposite of nucleophilic, which is when it wants a nucleus (proton).

The electrophile is the lewis base, and the nucleophile is the lewis acid.