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CHAPTER 8 ELECTRON CONFIGURATION AND CHEMICAL PERIODICITY 8.1 Elements be listed in the periodic prorogue in an edicted, systematic instruction that correlates with a periodicity of their chemical and physical properties. The theoretical base of operations for the table in terms of atomic number and negatron word form does not allow for an unknown member 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 altogether 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 atomic number 52, 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. etymon: a) Predicted atomic mass (K) = Na + Rb 22.99 + 85.47 = = 54.23 amu (actual think of = 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 value 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 exhaust the same four quantum numbers. Within a situation orbital, in that location can be only two electrons and they moldiness! consider paired spins. In a one-electron system, all sublevels of a special(prenominal) level have the same energy. In numerous electron systems, the principal energy levels are split into sublevels of differing energies. This ripping is delinquent 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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