12.短�期元素abc的原子序数依次递增它们的原子最外层电子数之和为10a与c同主族b原子的最外层电子数等于a原子的次外层电子数则 Template




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tomski12.短�期元素abc的原子序数依次递增它们的原子最外层电子数之和为10a与c同主族b原子的最外层电子数等于a原子的次外层电子数则 coloring