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CHAPTER 8 ELECTRON signifier AND CHEMICAL PERIODICITY 8.1 Elements argon listed in the periodic prorogue in an revisioned, systematic way that correlates with a periodicity of their chemical and corporeal properties. The theoretical basis for the card in terms of nuclear bout and negatron volume form does not include for an unknown element betwixt Sn and Sb. Today, the elements are listed in order of increasing nuclear number. This makes a difference in the sequence of elements in however a few cases, as the larger atomic number norm all(prenominal)y has the larger atomic mass. One of these exceptions is iodine, Z = 53 which is later tellurium, Z = 52, even out though tellurium has a high atomic mass. design: The honor should be the comely of the elements higher up and to a lower place the one of interest. Solution: a) Predicted atomic mass (K) = Na + Rb 22.99 + 85.47 = = 54.23 amu (actual observe = 39.10 amu) 2 2 b) Predicted melting tip (Br2) = Cl2 + I 2 ?101.0 + 113.6 = = 6.3°C (actual rate = 7.2°C) 2 2 a) Predicted boil 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 determine 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 negatron; all the others describe the orbital. at bottom an atom, no two electrons whitethorn befuddle the said(prenominal) four quantum numbers. Within a situation orbital, at that place can be plainly two electrons and they moldiness countenance paired spins. In a one-electron system, all sublevels of a feature level have the same energy. In numerous electron systems, the principal energy levels are split into sublevels of differing energies. This ripping is receivable to electron-electron repulsions. Be3+ would be more the like H since both(prenominal) have sole(prenominal) one 1s electron....If you want to compress a full essay, order it on our website: Ordercustompaper.com

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