12.右图是人体不可缺�的钙元素的原子结构示意图则有关钙原子的下列说法中正确的是 A.核外共有2个电子层 B.在化学反应中易失电子 C.核外 Template




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tomski12.右图是人体不可缺�的钙元素的原子结构示意图则有关钙原子的下列说法中正确的是 a.核外共有2个电子层 b.在化学反应中易失电子 coloring