# n+1 rule

##### Member
10+ Year Member
which of the following subshells will fill first?

use the n+1 rule and explain

5d
5f
6s
4f
6d

J

#### jackbauer!

which of the following subshells will fill first?

use the n+1 rule and explain

5d
5f
6s
4f
6d

6s....i dunno what this n+1 rule is you speak of....but just by looking at the periodic table you can tell that the answer is 6s.....

jb!

#### Streetwolf

##### Ultra Senior Member
10+ Year Member
7+ Year Member
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

##### New Member
10+ Year Member
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.

#### Law0830

##### Junior Member
10+ Year Member
From what i know the n+1 rule does not apply to subshells.

#### Streetwolf

##### Ultra Senior Member
10+ Year Member
7+ Year Member
Oh ya I think the n + 1 rule is for NMR.

So this is definitely the n + L rule, or w/e it's called.

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