The radius of cesium is roughly 0.26 nm.
(a) From this, estimate the effective charge its valence electron orbits.
(b) Given the nature of the electron's orbit, is this effective nuclear charge reasonable? (c) Compare this effective Z with that obtained for sodium in Example 8.3. Are the values at odds with the evidence given in Figure 8.16 that it takes less energy to remove an electron from cesium than from sodium? Explain.
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