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the world > matter > chemistry > elements and compounds > metals > specific elements > transition element > [noun] > groups IIIA-VIIA, VIII and IB (2)
transition element1892

(originally, now historical) any of the nine metallic elements forming group VIII of Mendeleev's periodic table; (now) any of a large class of…

transition metal1929

any of the metallic elements which have partially filled d or (less usually) f orbitals; cf. transition element n.

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