右图为元素�期表的一部分下列说法错误的是a.碳元素只能形成一种单质 B.氮原子的核外电子数为7 C.氧的相对原子质量为1600 D.cn Template




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tomski右图为元素�期表的一部分下列说法错误的是a.碳元素只能形成一种单质 b.氮原子的核外电子数为7 c.氧的相对原子质量为1600 coloring