Strong bases usually contain positively charged atoms of high electronegativity and no resonance stabilization.

Strong Bases

Substances that readily donate hydroxide ions or accept protons during a chemical reaction, characterized by their complete dissociation in water.

Electronegativity

An indicator of how strongly an atom pulls towards itself a pair of electrons that are being shared in a bond.

Resonance Stabilization

The stabilization of molecular structures by delocalizing electrons within conjugated systems or between atoms that can host multiple structures.