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Silver has long been valued as a precious metal, and is used as an investment, to make ornaments, jewelry, high-value tableware, utensils, and currency coins. dribble bola adalah It is also used in electrical contacts and conductors, in mirrors and in catalysis of chemical reactions Perak - Sifat-sifat, sejarah, nama asli, fakta, kegunaan, isotop, konfigurasi