金(英语:Gold),是一种化学元素,伊个化学符号是Au(源自拉丁语:Aurum),原子序数为79,原子量为196.966569 u。纯金是有明亮光泽、黄中带红、柔软、密度高、有延展性个金属。金拉元素周期表中是拉11族,属过渡金属,是化学性质最弗活泼个几种元素之一。金拉标准状况下是固体,拉自然界中常以游离态单质形式(自然金)存在,如岩石、地下矿脉搭冲积层中堆积个砂金或金粒。金能搭游离态个银形成固溶体琥珀金,拉自然界中也能搭铜、钯形成合金。矿物中个金化合物弗太常看到,主要是碲化金。
金能抵抗单一酸个侵蚀,但却能被王水溶解。迭种混合酸能搭金反应生成四氯合金酸根离子。金也能溶拉碱性氰化物溶液,迭是伊开采搭电镀个原理。
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