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### Why is this statement incorrect?

Posted: **Sat Dec 08, 2018 9:19 pm**

by **inlovewithchemistry**

A question from the midterm identified the statement "the lowest value that the magnetic quantum number ml can take is -9" as incorrect. Can someone explain WHY it is incorrect?

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### Re: Why is this statement incorrect?

Posted: **Sat Dec 08, 2018 9:23 pm**

by **Ethan Yi 1K**

for ml to be -9, the l value must be at least 9 and the n must be at least 10 which does not exist and it purely theoretical

### Re: Why is this statement incorrect?

Posted: **Sat Dec 08, 2018 9:25 pm**

by **MinaChoi_3H**

The quantum number is n=9. Then after is l, the subshell, and l = 0 through 8, remember that l = 0 through n-1. The question asks for magnetic quantum number ml which is -l through l, so it is -8 through 8, so the lowest value it can take is -8, not -9 (because l is 0 through 8).

### Re: Why is this statement incorrect?

Posted: **Sat Dec 08, 2018 9:26 pm**

by **405161024**

On the midterm it says for an atom with the quantum number n=9 so this implies l has to be smaller than 9, the lowest ml would be -8