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NEET Chemistry QUESTION #7353
Question 1
Which of the following sets of quantum numbers represents an arrangement that is NOT allowed for an electron in an atom?
  • \(n=3,\ \ell=2,\ m=-2,\ s=-\frac{1}{2}\)
  • \(n=4,\ \ell=0,\ m=0,\ s=-\frac{1}{2}\)
  • \(n=5,\ \ell=3,\ m=0,\ s=+\frac{1}{2}\)
  • \(n=3,\ \ell=2,\ m=-3,\ s=-\frac{1}{2}\)✔️
Correct Answer Explanation
Rules for valid quantum numbers:
  • \(n \geq 1\)
  • \(0 \leq \ell \leq n-1\)
  • \(-\ell \leq m \leq +\ell\)
In option (4): \(n=3, \ell=2\), so \(m\) can range from \(-2\) to \(+2\). But \(m = -3\) is outside this range, making it an invalid set. All other options satisfy the rules.