已知abcdef为元素�期表中原子序数依次增大的前20号元素a与bcd与e分别位于同一�期.a原子l层上有2对成对电子bc Template




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tomski已知abcdef为元素�期表中原子序数依次增大的前20号元素a与bcd与e分别位于同一�期.a原子l层上有2对成对电子bc coloring