族（化学）
拉化学中，元素周期表中个每一栏个化学元素称为族（英语：Group，Family）。长式周期表共分成18族，而f区元素个字段（拉第3族搭第4族之间）没编号。同一族中个元素（尤其是主族元素）具有相似个物理性质搭化学性质，因为伊拉个价电子构型相似，而价电子构型一般侪会决定元素个性质。当然，由于元素处拉弗同个周期，伊拉个性质也会有一定个递变性。
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