transition metal

noun

Definition of transition metal 

: any of various metallic elements (such as chromium, iron, and nickel) that have valence electrons in two shells instead of only one

called also transition element

First Known Use of transition metal

1940, in the meaning defined above

History and Etymology for transition metal

from their being transitional between the more highly and the less highly electropositive elements

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The first known use of transition metal was in 1940

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