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【简答题】
请认真回忆物质与其构成粒子之间的关系，回答下列问题： （1）是由______（填“原子”、“分子”或“离子”，下同）构成的，氯化钾是由______构成的，二氧化碳是由______构成的． （2）原子得到或失去电子后形成离子．某粒子的结构示意图为 ①当a=______时，该粒子是原子，该原子位于元素周期表中第______周期． ②当a=8时，该粒子是______（填“原子”、“阳离子”或“阴离子”）．
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