有abcde五种常见元素它们的核电荷数依次增大.a原子的原子核里只有一个质子b元素组成的单质是空气中含量第二多的物质d原子的核外 Template




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tomski有abcde五种常见元素它们的核电荷数依次增大.a原子的原子核里只有一个质子b元素组成的单质是空气中含量第二多的物质d原子的核外 coloring