which property of metals like silver and Aluminium allow them to be used to make reflectors of lamps
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1)It's shiny and neutral (silver) color. When polished, it has one of the highest and flattest reflectance of any metal.
2)It's highly corrosion resistant (in most environments) because it forms a thin, stable oxide layer.
3)It's cheap compared to solid metal alternatives: chrome, stainless steel, silver, etc.
4)It is relatively ductile, machinable, with a relatively low melting point. All these traits make it easy to manufacture parts, platings, and coatings with (Aluminium) Al.
5)It's relatively abundant, geographically well-distributed, and widely used.
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