如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7c.氧的相对原子质量为16.00d.cno的 Template




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tomski如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7c.氧的相对原子质量为16.00d.cno的 coloring