某元素原子的第二层电子数是第一层与第三层电子数之和该元素属于 A�属元素b非�属元素c稀有气体元素d不能确定 题目和参考答案 Template




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tomski某元素原子的第二层电子数是第一层与第三层电子数之和该元素属于 a�属元素b非�属元素c稀有气体元素d不能确定 题目和参考答案 coloring