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NEET CHEMISTRYStructure of AtomEasy

Question

Which of the following is not permissible arrangement of electrons in an atom?

A

n = 4, l = 0, m = 0, s = –1/2

B

n = 5, l = 3, m = 0, s = +1/2

C

n = 3, l = 2, m = –3, s = –1/2

D

n = 3, l = 2, m = –2, s = –1/2

Step-by-Step Solution

The permissible values for quantum numbers are governed by specific rules:

  1. Principal Quantum Number (nn): Must be a positive integer (1,2,3,...1, 2, 3, ...).
  2. Azimuthal Quantum Number (ll): Must be an integer from 00 to (n−1)(n-1).
  3. Magnetic Quantum Number (mlm_l): Must be an integer ranging from −l-l to +l+l (including zero).
  4. Spin Quantum Number (ss): Must be +1/2+1/2 or −1/2-1/2.

Analysis of Option C: Given n=3n = 3 and l=2l = 2. The permissible values for mm are −2,−1,0,+1,+2-2, -1, 0, +1, +2. The value m=−3m = -3 is not permissible because its magnitude exceeds ll.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Structure of Atom. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYStructure of Atomfollowingpermissiblearrangementelectrons

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