When the ionization energies of a series of isoelectronic atoms and ions are compared, an interesting relationship

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When the ionization energies of a series of isoelectronic atoms and ions are compared, an interesting relationship is observed for some of them. In particular, if the square root of the ionization energy (in kJ mol-1) for the series Li, Be+, B2+, C3+, N4+, O5+, and F6+ is plotted against the atomic number (Z) of the species, a linear relationship is obtained. The corresponding graph for the series Na, Mg+, Al2+, Si3+, P4+, S5+, and Cl6+ is also linear. The graph is shown below.

The equations for the two lines joining the points are

Second-row elements: VE = 18.4Z - 32.0 Third-row elements: VE 13.7Z 127 = (9.6) (9.7)

Explain the origin of these relationships and the differences in the numerical coefficients.

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General Chemistry Principles And Modern Applications

ISBN: 9780132931281

11th Edition

Authors: Ralph Petrucci, Jeffry Madura, F. Herring, Carey Bissonnette

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