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Warmup

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- 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

Quantum Numbers (cont’d)

Know the possible sets of quantum numbers…..

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, 0b. 3, 2, 3c. 3, 2, -2d. 1, 0, 0 e. 3, 2, 1

Electron Probability Activity!