[Visitor (23.83.*.*)]answers [Chinese ] | Time :2020-07-05 | Transition element: It is a chemical element from Group IIIB to Group VIII in the periodic table. The common feature of these elements in the atomic structure is that the valence electrons are sequentially filled in the d-orbit of the outer layer. Therefore, sometimes people also include lanthanides and actinides as transition elements. In addition, group IB elements (copper, silver, gold) also use d electrons in the formation of 2 and 3 valent compounds; group ⅡB elements (zinc, cadmium, mercury) have the ability to form stable coordination compounds with traditional transition elements Similar, therefore, group IB and IIB elements are often included in transition elements.
Atomic configuration
The outermost layer has only 1~2 electrons
Color form
Silvery white or gray, with metallic luster
Melting point Most transition elements are higher
Hardness density
Has greater hardness and density
Most refractory
Tungsten is the most refractory of all metals
Hardest
Chromium is the hardest of metals |
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