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",[321,398,399],{},"在外加电场的作用下，自由电子就会发生定向移动，形成电流，使金属表现出导电性","\n当温度升高时，阳离子的振动加剧，对自由电子的定向移动产生了阻碍作用，故导电能力下降。金属导电的粒子是自由电子，而电解质溶液导电的粒子是自由移动的阴阳离子\n",[371,402],{"alt":373,"src":403,"style":390},"https:\u002F\u002Fptg90phsi6rf8j7h.public.blob.vercel-storage.com\u002Fchemistry\u002F4.3.webp",[318,405,406,409],{},[321,407,408],{},"金属的导热性","\n自由电子在运动时与金属阳离子碰撞，引起两者能量的交换。当金属某部分受热时，那个区域里的自由电子能量增加，运动速度加快，通过碰撞，把能量传递给金属阳离子。自由电子与金属阳离子频繁碰撞，把能量从温度高的部分传递到温度低的部分，从而使整块金属达到相同的温度",[318,411,412,413,416],{},"金属光泽：\n由于金属内部原子以最紧密堆积状态排列，且存在自由电子，所以当光线照射到金属表面时，",[321,414,415],{},"自由电子可以吸收所有频率的光并迅速释放","，使金属不透明且具有金属光泽。而金属在粉末状态时，晶格排列不规则，吸收可见光后反射不出去，所以金属粉末常呈暗灰色或黑色",[311,418,420],{"id":419},"金属晶体的熔沸点硬度比较","金属晶体的熔沸点、硬度比较",[315,422,423,426,431,808],{},[318,424,425],{},"金属的熔沸点高低及硬度大小与金属键的强弱直接相关。金属键越强，金属的熔沸点越高，硬度一般也越大",[318,427,428],{},[321,429,430],{},"金属键的强弱主要取决于金属阳离子的半径和离子所带的电荷数",[318,432,433,434,523,524],{},"同周期金属单质，从左到右（如 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