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GRAD

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which of the following subshells will fill first?

use the n+1 rule and explain

5d
5f
6s
4f
6d
 

Streetwolf

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which of the following subshells will fill first?

use the n+1 rule and explain

5d
5f
6s
4f
6d
Actually it's n+L right?

s = 0
p = 1
d = 2
f = 3

So

5d = 5 + 2 = 7
5f = 5 + 3 = 8
6s = 6 + 0 = 6
4f = 4 + 3 = 7
6d = 6 + 2 = 8

Since 6 is the lowest, the 6s subshell fills first, followed by 4f and 5d (4f first since 4 < 5), then 5f and 6d (5f first since 5 < 6).
 

NickiM84

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1s
2s 2p
3s 3p 3d
4s 4p 4d 4f
5s 5p 5d 5f
6s 6p 6d 6f

Now draw arrows from right to left on a diagnol.
The first arrow will go through 1s
The second arrow will go through 2s
The third arrow will go through 2p and then 3s
The fourth arrow will go through 3p and 4s
Etc. Keep that pattern going and you will understand the order inwhich each subshell is filled. Hope that helped! Although it is difficult to explain without being able to draw it.
 
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