Are the effective nuclear charges listed in Figure 21.13 helpful in explaining the trend in the electron affinity with increasing atomic number? Explain your answer.

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Н Не 1s 1 1s 1.69 Li 2s 1.28 2s 1.91 Be Ne 2s 2.58 2s 3.22 2s 3.85 2s 4.49 2s 5.13 2s 5.76 2p 2.42 2p 3.14 2p 3.83 2p 4.45 2p 5.10 2p 5.76 Mg Si 3s 2.51 3s 3.31 3s 4.12 3s 4.90 3s 5.64 3s 6.37 3s 7.07 3s 7.76 | Зр 4.07 | Зр 4.29 |Зр 4.89 | Al CI Na Ar Зр 5.48 |Зр 6.12 | Зр 6.76 Se Ca Ga Ge As Br Kr 4s 3.50 4s 4.40 4s 7.07 4s 8.04 4s 8.94 4s 9.76 4s 10.55 4s 11.32 4p 6.22 4p 6.78 4p 7.45 4p 8.29 4p 9.03 4p 9.77 Sn 5s 4.98 5s 6.07 5s 9.51 5s 10.63 5s 10.61 5s 12.54 5s 13.40 5s 14.22 Rb Sr In Sb Te Xe 5p 8.47 5p 9.10 5p 9.99 5p 10.81 5p 11.61 5p 12.42