Answered: TABLE 7.4 Some Properties of the Alkali…

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)?

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!

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