18.现有abcde五种短�期元素它们的原子序数依次增大de同主族ab的最外层电子数之和与c的最外层电子数相等acd的 Template




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Try and sketch some of theseTriangle, Wood burning stove, Toboggan, Airship, Angel, Poker, Surrey, Solitaire, Swinging bridge, Lion, view more ideas


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tomski18.现有abcde五种短�期元素它们的原子序数依次增大de同主族ab的最外层电子数之和与c的最外层电子数相等acd的 coloring