The effective charge seen by Boron electron using Bohr model.

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Chapter 39, Problem 61GP

(a)

To determine

The effective charge seen by Boron electron using Bohr model.

(b)

To determine

The average orbital radius.

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The ionization (binding) energy of the outermost electronin boron is 8.26 eV. (a) Use the Bohr model to estimate the“effective charge,”Zeff seen by this electron. (b) Estimatethe average orbital radius.

For a K*- CF ion pair, attractive and repulsive energies E, and ER, respectively, depend on the distance between the ions r, according to 1.436 E4 -- 5.8 x 10-6 ER = For these expressions, energies are expressed in electron volts per K*- Cl- pair, and r is the distance in nanometers. a) If the net energy EN is just the sum of the two expressions above: EN = E+ ER, Find the values of r, and E,? b) If curves of E,, ER and EN are plotted in given figure, compare E, the calculated values of ro and E, with that from the graph. -0.28 nm E,-4.6 eV 0.00 0 10 0.20 0.30 0.40 0.50 060 0.70 0.80 00 1.00

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