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Cl的第一电离能小于F的原因是

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说明下列各对原子中哪一种原子的第一电离能高，为什么？（1）S与P；（2）Al与Mg；（3）Sr与Rb；（4）Cu与Zn；（5）Cs与Au；（6）Rn与At

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It's ____________ in Europe and budget flights that are changing the way they live.