## Energy level for n=3 and n=4?

Mariane Sanchez 1E
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

### Energy level for n=3 and n=4?

Hey all,

So for electron configuration I know we fill in 4s first before 3d. Does that mean that 3d has higher energy level than 4s? If yes/no, please help me understand why/why not. Thanks!

Naveed Zaman 1C
Posts: 62
Joined: Fri Sep 29, 2017 7:04 am
Been upvoted: 2 times

### Re: Energy level for n=3 and n=4?

The 3d subshell is higher in energy than the 4s subshell. There is actually a slight difference between energy levels 3 and 4, so that the energy in 4s is just barely below 3d. As you get to higher energy levels, the vague differences in energy also causes the 4f orbitals to begin in the 6th energy level/period (just another example of this kind of situation). Hope this helps!

Rana YT 2L
Posts: 49
Joined: Thu Jul 27, 2017 3:01 am

### Re: Energy level for n=3 and n=4?

The 3d sub shell is higher than 4s when the 4s subshell is full but the 3d subshell is completely empty. However, the minute that 3d gains an electron, the 4s subshell becomes the higher energy subshell.

McKenna disc 1C
Posts: 60
Joined: Fri Sep 29, 2017 7:04 am

### Re: Energy level for n=3 and n=4?

Are there any other instances in which there is a higher n value that has a lower amount of energy? Hope my phrasing makes sense.