Electron Configuration
Part II
Ellen Mercado
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Electron Configuration Part II
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2019/2020
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Electron Configuration
Part II
p
d
f
He H 1 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6
s
2
s-block
1 st Period
1 s
1 st column of s-block 1 2 3 4 5 6 7
Electron Configuration
Hydrogen
1 s 2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 1
That’s right: it goes in the 1 s sublevel. So its e- configuration is 1 s^2. Where does the next electron go? 1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s
1 s 2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s Note how He is right here in the area designated as 1 s 2 and so its e- configuration is 1 s^2.
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s
1 s
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2 2 p 1
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s Notice how B is situated in the 2 p^1 spot. So its full e- configuration is 1 s^2 2 s^2 2 p^1
1 s
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2 2 p 3
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s … we place one electron in each orbital until the sublevel is half filled …
1 s
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2 2 p 4
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s … and here we go back - start pairing off. This is called “Hund’s Rule, but it also known
- as the bus seat rule. Can you figure out why? 1 s
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2 2 p 6
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s Neon has a completely filled outer level. Na is next. Can you guess where the next electron is +^ going to go? 1 s
2 s 3 s 4 s 2 p 3 p 4 p 3 d 4 d s p d f 1 s 2 2 s 2 2 p 6 3 s 1
1 2 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 5 s
1 s