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CHAPTER 8 ELECTRON variant AND CHEMICAL PERIODICITY 8.1 Elements atomic number 18 listed in the periodic prorogue in an formated, systematic way that correlates with a periodicity of their chemical and fleshly properties. The theoretical basis for the prorogue in terms of nuclear soma and negatron intelligence information form does not for produce for an unknown element in the midst of Sn and Sb. Today, the elements are listed in order of increasing nuclear number. This makes a difference in the sequence of elements in whole a few cases, as the larger nuclear number norm in ally has the larger atomic mass. One of these exceptions is iodine, Z = 53 which is later tellurium, Z = 52, fifty-fifty though tellurium has a high atomic mass. intend: The honor should be the ordinary of the elements higher up and on a lower floor the one of interest. Solution: 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 care for = 7.2°C) 2 2 a) Predicted turn point (HBr) = HCl + HI ?84.9 + ( ?35.4) = = 60.15 = 60.2°C 2 2 b) Predicted change state 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. at heart an atom, no two electrons whitethorn dupe the uniform four quantum numbers. Within a situation orbital, in that respect can be but two electrons and they moldiness grant paired spins. In a one-electron system, all sublevels of a token level have the same energy. In numerous electron systems, the principal energy levels are split into sublevels of differing energies. This ripping is out-of-pocket to electron-electron repulsions. Be3+ would be more akin H since both(prenominal) have solitary(prenominal) one 1s electron....If you want to get a full essay, order it on our website: Ordercustompaper.com

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