transition-metal

柯林斯词典

transition element (also transition metal)

• 1. N any element belonging to one of three series of elements with atomic numbers between 21 and 30, 39 and 48, and 57 and 80. They have an incomplete penultimate electron shell and tend to exhibit more than one valency and to form complexes 過渡元素[chem]

返回 transition-metal