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Yugang Sun coauthored research on silver.^[ref]

Silver is the chemical element with atomic number 47 and symbol $\mathrm{Ag}$. It is a transition metal. It has high electrical conductivity and commonly forms $\mathrm{A}{\mathrm{g}}^{+}$. Silver halides respond to light through changes that can generate metallic silver, connecting a chemical transformation with photographic image formation.