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### 2.17 homework problem

Posted: **Wed May 02, 2018 6:46 pm**

by **Noah Carey 1G**

I don't understand why we don't count other orbitals when finding the number of orbitals inside of a sub shell. For part b in 2.17, l=2 so we know that it goes to the d orbital which has 5 spaces to fill. And the answer is 5 orbitals. But what about the s orbital and p orbital that comes before it? My instinct was to include those and add them all together, why is that wrong?

### Re: 2.17 homework problem

Posted: **Wed May 02, 2018 10:12 pm**

by **Kara Justeson 1B**

I believe for this part it's because they give you the angular momentum quantum # (l). Since they told you l=2, like you said you know it would be the d subshell. Because they told you l=2 you're only looking at that particular subshell not including the s or p.

### Re: 2.17 homework problem

Posted: **Wed May 02, 2018 10:37 pm**

by **Kuldeep Gill 1H**

Kara is right! so if they did not give you the l value and just told you n=3 that's when you would include the orbitals in the s and p but since they gave you the l value its a little more specific than just saying all the orbitals in period 3.