Sc3+ Scandium(III) ion Sc 1   Charge = +3   Real ion. Gram formula weight (molecular mass) = 44.955 Scandium(III) ion is defined with respect to the entities below: The entities below are defined with respect to: Scandium(III) ion Hard Lewis acid (generic) Heavy metal Lewis acid (generic) Real atomic ion (generic) chemical compound molecule metal molecular science reaction mechanism ionic material acid base geometry reactivity synthesis science knowledge chemistry Lewis