本题目来源于试卷: Classification of Matter A.1 Periodic Table Elements Classification，类别为 IB化学
[单选题]
Metalloid elements play important roles in electru a0oxz jczr5a5*)*imonic components, such as .htbrz )f-qh99o w:xtfv/6:g o;ygfc solar cells and computer chips. Which of the following hc/:tb)h;zqg wy x.fo f-t9 of6r9 :gvis the correct definition of a metalloid?
A. Elements with a mixture of metallic and non-metallic physical properties
B. Elements that convert from metals to non-metals with changing temperature
C. Metals found in the p block of the periodic table
D. Metals with incomplete d subshells
参考答案: A
本题详细解析:
Explanation: Metalloids lie on the boundary between metals and non-metals in the p block of the periodic table. They are shiny like metals but brittle like non-metals, and can switch between being electrical insulators and electrical conductors. Although this switchable conductivity could be considered as a change from metal-like to non-metal-like behaviour, it does not affect all properties of the element: the element does not switch from being a metal to a non-metal. Metalloids do not contain incomplete d subshells (this is a property of transition metals) and lie alongside the poor metals in the p block of the periodic table. This question is categorised as moderately difficult as the concept of metalloids is not covered extensively in the syllabus, though the distinction between metals, non-metals and metalloids is highlighted.
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