atomic number 40


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Noun1.atomic number 40 - a lustrous grey strong metallic element resembling titaniumatomic number 40 - a lustrous grey strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon
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.
baddeleyite - a mineral consisting of zirconium oxide
zircon, zirconium silicate - a common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent