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MDCAT Chemistry QUESTION #4357
Question 1
Which set of quantum numbers is NOT allowed for an electron?
  • $n=2,\ l=1,\ m=0,\ s=+\frac{1}{2}$
  • $n=3,\ l=0,\ m=0,\ s=-\frac{1}{2}$
  • $n=2,\ l=2,\ m=1,\ s=+\frac{1}{2}$✔️
  • $n=1,\ l=0,\ m=0,\ s=+\frac{1}{2}$
Correct Answer Explanation
For $n=2$, the allowed values of $l$ are $0$ and $1$ only (since $l$ ranges from $0$ to $n-1$). Having $l=2$ when $n=2$ is not allowed, making this set invalid.