What determines in an acid is going to be strong or weak?

Answer 1

All acids consist of some non-metallic element or radical that is combined with hydrogen. There is a quantity called electronegativity which measures the degree to which a given atom or radical attracts electrons. The higher the electronegativity that any given atom or radical has, the stronger the acid it will form when it combines with hydrogen. The highest known electronegativity is 4, which is the electronegativity of fluorine. Therefore, hydrofluoric acid is the stongest acid.