Some compounds turn dark when exposed to light. They are, therefore, used in photography. A metal used for making such compounds is:
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Silver.
Explanation:
A silver halide (or silver salt) is one of the chemical compounds that can form between the element silver and one of the halogens. Silver halides are used in photographic film and photographic paper, including graphic art film and paper, where silver halide crystals in gelatin are coated on to a film base, glass or paper substrate. The gelatin is a vital part of the emulsion as the protective colloid of appropriate physical and chemical properties.
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Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because ___________.