铜及其合�是人类最早使用的�属材料。 1铜原子的核外电子排布式是 。 2铜的熔点比钙的高,其原因是 ;如图是�属ca和cu所形成的某种 Template




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tomski铜及其合�是人类最早使用的�属材料。 1铜原子的核外电子排布式是 。 coloring