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Warmup. Write the full ground-state electron configuration for selenium. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4 2. Which of these electron configurations is impossible? a. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 8 4p 6 b. 1s 2 2s 2 2p 6 2d 10 3s 2 3p 4 c. 1s 2 2s 2 2p 4 3s 1 3p 6 4s 2 3d 6
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Warmup • Write the full ground-state electron configuration for selenium. 1s22s22p63s23p64s23d104p4 2. Which of these electron configurations is impossible? a. 1s22s22p63s23p64s23d84p6 b. 1s22s22p62d103s23p4 c. 1s22s22p43s13p64s23d6 d. 1s22s22p63s23p64s03d5 Se….but the excited state! Uhhhhh 2d doesn’t exist Excited state! CAN happen for sure! fine
7p 6d 5f 7s 6p 5d 6s 4f 5p 4d 5s 4p 3d 4s 3p Increasing energy 3s 2p 2s 1s 10. What are the Quantum Numbers for the highest energy e- in Se? n = 4 (but other e- can be 3,2,1) l = 3 (but other e- can be 2,1,0) ml can be 3 to -3, but this e- is in the first p shape so it’s -1 ms = + ½ or -½ (second e- in shape)
11. Which of the following represents an acceptable possible set of quantum numbers (in the order n, l, ml, ms for an electron in an atom? a. 2, 1, -1, 1/2 b. 2, 1, 0, 0 c. 2, 2, 0, 1/2 d. 2, 0, 1, -1/2 e. 2, 0, 1, +1/2 12. Which set of quantum numbers corresponds to a 3d orbital? a. 2, 1, 0 b. 3, 3, 2 c. 3, 2, 3 d. 3, 2, 2 e. 2, 3, 3 13. An electron cannot have the quantum numbers n = ___, l = ____, ml = ____. a. 6, 1, 0 b. 3, 2, 3 c. 3, 2, -2 d. 1, 0, 0 e. 3, 2, 1
