What type of metals as a choice to make a sun reflector alkiali metals alkaline earth metals or transition metals The metal cannot react with water or oxygen and must be shiny and strong?

For a sun reflector that must be shiny, strong, and resistant to reaction with water and oxygen, transition metals would be the best choice. Metals like aluminum or stainless steel (which contains chromium and nickel) are effective for reflectivity and durability. Alkali metals and alkaline earth metals are not suitable, as they readily react with water and oxygen, compromising their stability and reflective properties. Transition metals provide the necessary strength and corrosion resistance for effective sun reflectors.