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Quiz_2_section_1B_answer

Quiz_2_section_1B_answer - Name:AnswerKey Quiz2...

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Name: Answer Key October 18, 2010 TA: Robert 20A Disc 1B Quiz 2 1. Circle the letter of the set of quantum numbers that is NOT allowed (there may be more than one answer): (10 pts) a. n = 3, l = 2, m = 1, m s = ½ b. n = 4, l = 2, m = ‐1, m s = ½ c. n = 2, l = 1, m = ‐2, m s = ½ not allowed: m = ‐ l… 0 …+l d. n = 1, l = 1, m = 1, m s = ‐½ not allowed: l = n‐1…..0 2. How many radial nodes are present for n = 3, l = 1? How many angular nodes? (10 pts) a. Radial Nodes: n – l – 1 = 3 – 1 – 1 = 1 radial nodes b. Angular Nodes: l = 1 angular nodes 3. The effective charges for nitrogen are: Z eff (1s) = 6.66, Z eff (2s) = 3.85, and Z eff (2p) = 3.83. Calculate the average distance of an electron from the nucleus in the 2s orbital. (10 pts) r n = n 2 a 0 Z eff ( n ) 1 + 1 2 1 ( + 1) n 2 r n = 2 2 (5.29*10 11 m ) 3.85 1 + 1 2 1 0(0 + 1) 2 2 = 8.24 *10 11 m 4. The effective charges for carbon are: Z eff (1s) = 5.67, Z eff (2s) = 3.22, and Z eff (2p) = 3.14.

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• Spring '11
• LIU
• EFF, me=9.109x1031kg mp=1.673x1027kg mn=1.675x1027kg, =q1q2/40r=Ze2/40r E=h=hc/ =h/mv=h/p, e=1.602x1019C F=ma J=Nm, Robert 20ADisc1B

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