We can use zeff to predict properties and determine

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Unformatted text preview: f to predict properties and determine the amount of energy it takes to remove an electron from its ‘home’. The net positive charge attracting the e- (Zeff) will vary depending on where the electron is residing. In general, Zeff can be expressed by: z actual- electron shielding S. ____________________________________ where Zactual equals the number of protons in the nucleus (and is thus the charge of the nucleus) and S is the average number of e- b/w the nucleus and the e- in question. e.g.,electron 92 in uranium - 91 electrons r there b/w nucleus and its outermost shell. in the diagram we see that outer electrons are not just attracted by the nucleus but also pushed away or under repulsion by the inner electrons. this attraction and repulsion creates a balance. 15 05-Sep-13 Penetration effect • Describes the proximity of an orbital to the nucleus. • Electrons in different orbitals have different distributions around the nucleus. • Electrons which experience greater penetration experience less shielding and therefore experience a larger Effective Nuclear Charge (Zeff). • T...
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