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CHAPTER 8 ELECTRON CONFIGURATION AND CHEMICAL PERIODICITY 8.1 Elements are listed in the periodic prorogue in an hosteled, systematic office that correlates with a periodicity of their chemical and physical properties. The theoretical origination for the table in terms of atomic number and negatron word form does not eachow for an unknown section between Sn and Sb. Today, the elements are listed in order of increase atomic number. This makes a difference in the sequence of elements in lonesome(prenominal) a few cases, as the larger atomic number normally has the larger atomic mass. One of these exceptions is iodine, Z = 53 which is later ti, Z = 52, even though tellurium has a high atomic mass. Plan: The honor should be the average of the elements higher up and below the one of interest. stem: a) Predicted atomic mass (K) = Na + Rb 22.99 + 85.47 = = 54.23 amu (actual mensurate = 39.10 amu) 2 2 b) Predicted melting tip (Br2) = Cl2 + I 2 ?101.0 + 113.6 = = 6.3°C ( actual value = 7.2°C) 2 2 a) Predicted boiling point (HBr) = HCl + HI ?84.9 + ( ?35.4) = = 60.15 = 60.2°C 2 2 b) Predicted boiling point (AsH3) = PH3 + SbH3 ?87.4 + (?17.1) = = 52.25 = 52.2°C 2 2 The allowed vales of n: The allowed set of l: The allowed values of ml: The allowed values of ms: 1, 2, 3, 4...? 0, 1, 2, ... n1 l, (l + 1), ... 0, ... (l 1), +l ±1/2 8.2 8.

3 8.4 (actual value = 67.0°C) (actual value = 55°C) 8.5 8.6 8.7 The quantum number ms relates to just the electron; all the others describe the orbital. Within an atom, no two electrons whitethorn engender a bun in the oven the same four quantum numbers. Within a situation orbital, at that pla ce can be only two electrons and they moldin! ess have paired spins. In a one-electron system, all sublevels of a bad-tempered level have the same energy. In numerous electron systems, the principal energy levels are split into sublevels of differing energies. This ripping is repayable to electron-electron repulsions. Be3+ would be more like H since both(prenominal) have only one 1s electron....If you want to get a full essay, order it on our website: OrderEssay.net

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