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AIIMS2019Chemistry-Atomic Structure

AIIMS 2019 Chemistry Quantum Numbers MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which one of the following set of quantum numbers is not possible for 4p4p electron?

A

n=4,l=1,m=−1,ms=+12n = 4, l = 1, m = -1, m_s = +\frac{1}{2}

B

n=4,l=1,m=0,ms=+12n = 4, l = 1, m = 0, m_s = +\frac{1}{2}

C

n=4,l=1,m=2,ms=+12n = 4, l = 1, m = 2, m_s = +\frac{1}{2}

D

n=4,l=1,m=−1,ms=−12n = 4, l = 1, m = -1, m_s = -\frac{1}{2}

Correct Answer

Option C

Detailed Explanation

In the context of electron configuration, the 4p subshell can accommodate a total of six electrons, with the quantum numbers n=4n = 4 (principal), l=1l = 1 (azimuthal), and m=−1,0,+1m = -1, 0, +1 (magnetic) representing the three possible orientations of the p orbital. The spin quantum number ss can be either +12+\frac{1}{2} or −12-\frac{1}{2}, allowing for two electrons per orbital. Since option C correctly identifies the possible configurations for a 4p electron, it is valid, while the other options are not applicable as they do not provide relevant information regarding the electron's quantum state.

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