atomic number 39

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Noun

atomic number 39 - a silvery metallic element that is common in rare-earth minerals; used in magnesium and aluminum alloys

Y, yttrium

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.

fergusonite - a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals

gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium

xenotime - a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form

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Most of the rare earths consist of the elements between the lanthanum (atomic number 57) and lutetium (atomic number 71), with two outliers: scandium (atomic number 21) and yttrium (atomic number 39).

The race for rare earths: Toronto's Avalon Rare Metals has joined the global race to extract rare earth chemicals--key elements in many energy-generating green technologies