monovalent

/ˌmɑnoʊˈveɪlənt/
adjective
  1. Having a single unit of combining power in chemistry; able to combine with one atom of hydrogen or its equivalent.
    • The chemist explained that monovalent ions have a charge of plus or minus one.
    • In the vaccine, the monovalent formula targets only one strain of the virus.
    • Sodium is a monovalent element, meaning it typically forms one chemical bond.
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