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【简答题】
图甲是两种元素在元素周期表中的信息，图氟元素的原子结构示意图． （1）图甲方框的横线上______，图乙方框的横线上______． （2）在元素周期表中，氟位于第______周期． （3）图甲所示两种元素组成化合物的化学式是______．
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