Hard Lewis base (generic) Pearson hard Lewis base (generic)   Special class of generic used to represent "generic chemical reactivity behaviour" rather than structure. Wikipedia Page: Hard Lewis base (generic) is defined with respect to the entities below: The entities below are defined with respect to: Hard Lewis base (generic) Acetate ion Alcohol (generic) 1° Amine (generic) Ammonia Carbonate ion Chloride ion Ether (generic) Fluoride ion Hydrazine Hydroxide ion Nitrate ion Perchlorate ion Phosphate ion Sulfate ion Water chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis