TABLE 7.4 Some Properties of the Alkali Metals Melting Point (°C) Density (g/cm³) Atomic Electron Radius (Å) (kJ/mol) Configuration Element Lithium [He]2s' 181 0.53 1.28 520 0.97 496 Sodium 98 1.66 [Ne]3s! Potassium 63 0.86 2.03 419 [Ar]4s! Rubidium 39 1.53 2.20 403 [Kr]5s' 1.88 2.44 Cesium 28 376 [Xe]6s!
TABLE 7.4 Some Properties of the Alkali Metals Melting Point (°C) Density (g/cm³) Atomic Electron Radius (Å) (kJ/mol) Configuration Element Lithium [He]2s' 181 0.53 1.28 520 0.97 496 Sodium 98 1.66 [Ne]3s! Potassium 63 0.86 2.03 419 [Ar]4s! Rubidium 39 1.53 2.20 403 [Kr]5s' 1.88 2.44 Cesium 28 376 [Xe]6s!
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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(a) Write the electron configuration for Li and estimate the
effective nuclear charge experienced by the valence electron.
(b) The energy of an electron in a one-electron atom or ion equals (-2.18 x 10-18 J) aZ2/n2 b, where Z is the nuclear charge
and n is the principal quantum number of the electron. Estimate
the first ionization energy of Li. (c) Compare the result
of your calculation with the value reported in Table 7.4 and
explain the difference. (d) What value of the effective nuclear
charge gives the proper value for the ionization energy? Does
this agree with your explanation in part (c)?
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