元素周期表上为什么会分主族和副族,有什么用
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![元素周期表上为什么会分主族和副族,有什么用](/uploads/image/z/2723303-47-3.jpg?t=%E5%85%83%E7%B4%A0%E5%91%A8%E6%9C%9F%E8%A1%A8%E4%B8%8A%E4%B8%BA%E4%BB%80%E4%B9%88%E4%BC%9A%E5%88%86%E4%B8%BB%E6%97%8F%E5%92%8C%E5%89%AF%E6%97%8F%2C%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8)
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