abc三种元素其中有一种�属元素ab原子的电子层数相同bc原子的最外层电子数相同又知这三种元素原子的最外层电子数之和为17 Template




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tomskiabc三种元素其中有一种�属元素ab原子的电子层数相同bc原子的最外层电子数相同又知这三种元素原子的最外层电子数之和为17 coloring