valence

/ˈveɪləns/

noun

An extract; a preparation, now especially one effective against a certain number of strains of a pathogen.
The combining capacity of an atom, radical or functional group determined by the number of electrons that it will lose, gain, or share when it combines with other atoms etc.
Similar: valency
The number of binding sites of a molecule, such as an antibody or antigen.

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