atomic number 42

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Noun1.atomic number 42 - a polyvalent metallic element that resembles chromium and tungsten in its propertiesatomic number 42 - a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel
molybdenum, Mo
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.
molybdenite - a mineral resembling graphite that is valued as the chief source of molybdenum and its compounds
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