Chemistry Week 7 Group Problems - 7.33 Careful spectrum...

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7.33 Careful spectrum analysis shows that the familiar yellow light of sodium lamps (such as street lamps) is made up of photons of two wavelengths, 589.0nm and 589.6nm. What is the difference in energy (in joules) between photons with these wavelengths? Answer: E=hv, E=hc/&lambda; E<sub>1</sub>=6.63x10<sup>-34</sup>J s(3x10<sup>8</sup>m/s)/(589.0nm x 1x10<sup>-9</sup>m) E<sub>1</sub>=3.377 x 10<sup>-19</sup>J E<sub>2</sub>=6.63x10<sup>-34</sup>J s(3x10<sup>8</sup>m/s)/(589.6nm x 1x10<sup>-9</sup>m) E<sub>2</sub>=3.373 x 10<sup>-19</sup>J E<sub>1</sub> - E<sub>2</sub>=3.377 x 10<sup>-19</sup>J - 3.373 x 10<sup>- 19</sup>J = 4 x 10<sup>-22</sup>J 7.83 Write the ground-state electron configurations for the following elements: B, V, Ni, I Answer: B: 1s<sup>2</sup>2s<sup>2</sup>2p<sup>1</sup> V: 1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>4s<s
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Unformatted text preview: up>2</sup>3d<sup>2</sup> Ni: 1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>4s<s up>2</sup>3d<sup>8</sup> I: 1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>4s<s up>2</sup>3d<sup>10</sup>4p<sup>6</sup>5s<sup>2</sup>4d<sup>10</sup>5p<sup >5</sup> 8.37 On the basis of their positions in the periodic table, select the atom with the larger atomic radius in each of the following pairs: (a) Na, Cs; (b) Be, Ba; (c) N, Sb; (d) F, Br; (e) Ne, Xe. Answer: (a) Cs (b) Ba (c) Sb (d) Br (e) Xe 8.59Arrange the elements in each of the following groups in increasing order of the most positive electron affinity: (a) Li, Na, K; (b) F, Cl, Br, I. Answer: (a) K, Na, Li (b) I, Br, F, Cl...
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