如图是氟元素钙元素在元素�期表中的信息abcd是四种粒子的结构示意图请回答下列问题1氟元素的相对原子质量为1900钙原子 Template




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tomski如图是氟元素钙元素在元素�期表中的信息abcd是四种粒子的结构示意图请回答下列问题1氟元素的相对原子质量为1900钙原子 coloring