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?

Table 10.2

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Conductivity (S/m) Crystal structure Lattice parameter () Rb 8.3x106 bcc 5.58 Cs 5.0106 bcc 6.14 Sr 7.7x106 fcc 6.08 Ba 2.910 bcc 5.03