MCQ
An electron has magnetic quantum number as $-3.$ Its principal quantum number can be
- A$1$
- B$2$
- C$3$
- ✓$4$
✓
Answer
Correct option: D.
$4$
d
$An ^{-}$has magnetic quantum number as $-3$, its principal quantum number is $4$.
$An ^{-}$has magnetic quantum number as $-3$, its principal quantum number is $4$.
When $m =-3,l=3 \quad \therefore n =4$
Note: For a given value of $n, 1$ can have values $0,1,2, \ldots . .(n-1)$ and $m$ can have values $-l, \ldots .-2,-1,0,+1,+2 \ldots+l$.
For $n=4,l$ can have values $0,1,2,3$.
For a given value of $l, m$ can have values $-3,-2,-1,0,+1,+2,+3$.
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