scandium
- n a white trivalent metallic element; sometimes classified in the rare earth group; occurs in the Scandinavian mineral thortveitite
- Meanwhile, the Hydraulic Research Establishment is trying radioactive scandium-glass on Britain's beaches to find out how they get eroded away.
- Boron is lightest of the earth metals (boron, aluminum, scandium, yttrium, lanthanum, actinium).