元素�期表是学习和研究化学的重要工具如图是元素�期表中元素的示意图下列关于硅元素的说法正确的是a相对原子质量是14b中子数是28c Template




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tomski元素�期表是学习和研究化学的重要工具如图是元素�期表中元素的示意图下列关于硅元素的说法正确的是a相对原子质量是14b中子数是28c coloring