atomic number 70


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Noun1.atomic number 70 - a soft silvery metallic elementatomic number 70 - a soft silvery metallic element; a rare earth of the lanthanide series; it occurs in gadolinite and monazite and xenotime
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
xenotime - a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form