## Electron Configuration

Cytlalli 1B
Posts: 23
Joined: Fri Apr 06, 2018 11:02 am

### Electron Configuration

Why does the d-orbital start at 3 while the s and p start off at 1,2,.. and so on?

Ismail 1F
Posts: 32
Joined: Wed Nov 15, 2017 3:02 am

### Re: Electron Configuration

The 4s orbitals fill first and have a lower energy than 3d, so the 4s needs to be filled first.

KateCaldwell 1A
Posts: 43
Joined: Fri Apr 06, 2018 11:02 am

### Re: Electron Configuration

These numbers are determined by the l quantum number. The l number is the amount of orbitals an element can carry.

nikitasridhar_1b
Posts: 42
Joined: Fri Apr 06, 2018 11:05 am

### Re: Electron Configuration

the first shell (n=0) only has one subshell, so it only has s orbitals. after that the second shell (n=1) has two subshells, and therefore has s and p orbitals. the third shell (n=2) has 3 subshells and therefore has s,p, AND d.

Paywand Baghal
Posts: 32
Joined: Fri Apr 06, 2018 11:01 am

### Re: Electron Configuration

KateCaldwell 1A wrote:These numbers are determined by the l quantum number. The l number is the amount of orbitals an element can carry.

how do you figure out the l quantum number

KateCaldwell 1A
Posts: 43
Joined: Fri Apr 06, 2018 11:02 am

### Re: Electron Configuration

There isn't a formula to find l number; it is just standard numbers we need to know. s=0, p=1, d=2, f=3. The only other way to solve for it is through n-1= l max.

004985802
Posts: 27
Joined: Fri Feb 02, 2018 3:00 am

### Re: Electron Configuration

d is only present in the 3rd energy level and higher because in each energy level (1-4) an orbital (s p d f) is added. The first energy level only has an s orbital, the second has s and p, and the third has s, p, and d.