The conductivities and crystal structures of the heavier s-block metals are given in the table below. (a)

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The conductivities and crystal structures of the heavier s-block metals are given in the table below.

(a) Calculate the valence-electron concentration n in m−3 and arrange the elements from lowest to highest n.

(b) Use these values and those for lighter s-block elements Na, K, Mg, and Ca in Table 10.2 to construct a plot of electrical conductivity (in S/m) versus valence-electron concentration (in m−3).

(c) What can you say about how well these metals follow the predictions of the Drude model?

Conductivity (S/m) Crystal structure Lattice parameter () Rb 8.3x106 bcc 5.58 Cs 5.0106 bcc 6.14 Sr 7.7x106

Table 10.2

Metal Rb K Na Ca Mg Al 1.11028 1.31028 2.51028 4.6x1028 8.6x1028 18.01028  (S/m)  0.8107 1.4107 2.1107

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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