Words That End With: RIUM

• a transuranic element with atomic number 107

• a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands

• a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

• a ductile grey metallic element of the lanthanide series; used in lighter flints; the most abundant of the rare-earth group

• a soft silvery metallic element of the alkali earth group; found in barite

• a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei

• the deep vascular inner layer of the skin

• any chamber that is connected to other chambers or passageways (especially one of the two upper chambers of the heart)

• the central area in a building; open to the sky