CH7 notes - Chapter 7 Periodic Properties of the Elements A...

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Chapter 7 Periodic Properties of the Elements A. Shielding and Effective Nuclear Charge B. Atomic Size C. Ionization Energy D. Electron Affinity E. Descriptive Chemistry of Selected Elements HW #P7 Quiz 4, Final Exam
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Chapter 7 Periodic Properties of the Elements The periodic table was derived because some elements have similar properties. In Chapter 6 we found that electron configurations play a role. A. Shielding And Effective Nuclear Charge Shielding and effective nuclear charge are the keys to understanding atomic size and ionization potential. An electron is attracted to the nucleus with the amount of attraction directly proportional to the nuclear charge experienced by that electron. Consider Li.
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The 1s electrons shield the 2s electron from the nuclear charge such that the 2s electron is attracted by a nuclear charge of h 1 (actually 1.3); this is the effective nuclear charge . Now consider Be.
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The effective nuclear charge on the 2s electrons of Be is 1.9.
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