Valence or valency may refer to: In molecules, atoms, or subatomic particles Valence (chemistry) Valence bond theory in chemistry Valence shell in chemistry Valence band in physics Valence quarks (see quark model) in particle physics In other sciences Valency (linguistics) Valence (psychology) (and neuroscience), referring to the emotional value associated with a stimulus; for example, a familiar face can have positive valence Valence effect, another page on the psychological phenomenon The de… (More on Valence)