- Element A displays properties of a metal (high conductivity, not brittle).
- Element B displays properties of a nonmetal (low conductivity, not lustrous).
- Element C displays properties of a metalloid (luster, brittleness, medium conductivity).
- Therefore, Element C is the most likely metalloid.
- The final answer is \(\boxed{C}\).
Explanation
- Analyzing Element Properties
The properties of metalloids are intermediate between those of metals and nonmetals. Specifically, metalloids often exhibit metallic luster, are brittle (unlike most pure metals), and demonstrate semiconductor behavior, characterized by medium electrical conductivity. We evaluate the given elements based on these criteria:
- Element A: It is lustrous and has high electrical conductivity, but it is not brittle. High electrical conductivity and lack of brittleness are hallmark properties of metals.
- Element B: It is not lustrous, is brittle, and has very low electrical conductivity. These characteristics are typical of nonmetals.
- Element C: It exhibits a metallic luster, is brittle, and has medium electrical conductivity. These combined properties directly align with the defining characteristics of a metalloid.
- Conclusion
By comparing the findings for elements A, B, and C with the established profile of a metalloid, it becomes clear that Element C is the only one displaying the characteristic combination of properties: luster, brittleness, and intermediate electrical conductivity. Thus, Element C is the most likely metalloid.
Examples
Metalloids play a crucial role in modern technology because of their unique electrical properties. Silicon, for example, is a classic metalloid used extensively in computer chips and solar cells. Understanding these properties helps scientists choose the right materials for advanced electronics, where conductivity must be controlled precisely, unlike in a basic metal conductor or a non-metallic insulator. This classification is fundamental to material science and the development of sustainable energy technologies.