December 14. You may hand in the exam early if you wish but late exams will not

Question

December 14. You may hand in the exam early if you wish but late exams will not be accepted Use extra paper as needed and STAPLE to the exam. Unstamped sheets will be penalized 5 points. You must show your work to receive credit. No work or incorrect work - no credit. A contestant in the American Chemical Society Laboratory Technician Beauty Contest was described in the following terms: Her hair was like spun [Ar]3d^64s^2 her skin was as soft as [Xe] 4f^14 5d^46s^2, her perfume was the hydride of [Ne] 3s^23p^4, and her personality was completely [He]2s^22p^1 Identify the elements and describe these 4 attributes of her in more conventional terms. Fill in the missing information from the table

Explanation / Answer

(1)

Fe (z= 26) e.c is [Ar]3d6 4s2

W (Z=74) e.c is [Xe]4f14 5d4 6s2

S (Z= 16) e.c is [Ne]3s2 3p4

B (z=5) e.c is [He] 2s2 2p1

(52)

Li (Z=3) excited electronic configuration 1s2 2p1

H-(Z=1) e.c is 1s2 - anion

S (Z=16) e.c. 1s2 2s2 2p6 3s2 3p4 - neutral

C (Z=6) electronic configuration is 1s2 2s2 2p1 2d1 - impossible ( no d- in second shell)

Ne(Z=10) e.c is 1s2 2s22p7 - impossible (6 electrons arepossible in p)

F(z=9) 1s2 2s2 2p5 3s1 - impossible

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