银色兔
Silver
「The Silver rabbit is a rare breed of domestic…」
The Silver rabbit is a rare breed of domestic rabbit believed to be brought to England by Sir Walter Raleigh in 1592. The breed has been bred for meat, show, and its pelt ever since and is recognized by the American Rabbit Breeders Association (ARBA).
简介暂为英文公开资料摘要,后续将逐步整理为手册口吻。
銀是一種化學元素，符號Ag，原子序47，原子量為107.8682 u。銀為質地柔軟且帶有白色光澤的金屬，俗稱白銀，導電率、導熱率、反射率均在金屬中名列前茅。銀在地殼中以高純度的元素（自然銀）、與其他金屬形成合金，或以礦石的形式存在（如輝銀礦和角銀礦）。大部分的銀是銅、金、鉛和鋅精煉的副產品。
资料来源 · 维基百科（CC BY-SA）
👁形貌
Chemical element with atomic number 47 (Ag) Cu ↑ Ag ↓ Au palladium ← silver → cadmium Atomic number (Z) 47 Group group 11 Period period 5 Block d-block Electron configuration [Kr] 4d 10 5s 1 Electrons per shell 2, 8, 18, 18, 1 Physical properties Phase at STP solid Melting point 1234.93 K (961.78 °C, 1763.2 °F) Boiling point 2435 K (2162 °C, 3924 °F) Density (at 20° C) 10.503 g/cm 3 (at STP) 10,515 g/L when liquid (at m.p.) 9.320 g/cm 3 Heat of fusion 11.28 kJ/mol Heat of vaporisation 254 kJ/mol Molar heat capacity 25.350 J/(mol·K) Specific heat capacity 235.005 J/(kg·K) Vapour pressure At
📜源流
Silver was known in prehistoric times: the three metals of group 11, copper, silver, and gold, occur in the elemental form in nature and were probably used as the first primitive forms of money as opposed to simple bartering. Unlike copper, silver did not lead to the growth of metallurgy, on account of its low structural strength; it was more often used ornamentally or as money. Since silver is more reactive than gold, supplies of native silver were much more limited than those of gold. For example, silver was more expensive than gold in Egypt until around the fifteenth century BC: the Egyptia