We need to know about the type of material used to make most metallic items, including silverware, automobile frames, tea kettles, and coins.
The material used to make most metallic items, including silverware, automobile frames, tea kettles, and coins is alloys (not ionic compounds, plastics or pure metals).
Metallic items are made of alloys not pure metals because pure metals are soft.
An alloy is a solid solution of metal elements (single phase) or a mixture of metallic phases (two or more solutions). The hardness of any metal can be enhanced by alloying it with another metal.
Plastics (basically non-metals) are not heat resistant, not hard enough as metal.
Ionic compounds are soluble in polar solvents like water.
Alloys can be produced as per requirement by mixing alloying elements (metallic).