A Brønsted acid is an acid that donates a hydrogen ion to another compound. An acid (often represented by the generic formula AH) is typically a water-soluble, sour-tasting chemical compound. ... General Name, Symbol, Number Hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1 (IA), 1, s Density, Hardness 0. ... An ion is an elementary particle or system of elementary particles with a net electric charge. ...