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ChemistryJEE Main 4 Apr 2026, Shift 1·Q3·MCQ·Easy–moderate

Structure of Atom · Quantum numbers and aufbau principle

Which of the following is correct set of 4 quantum number of 19th^\text{th} electron in Chromium (Atomic number == 24) in accordance with Aufbau principle?
  1. (1)n=3n = 3, ℓ=2\ell = 2, m=+2m = +2, s=+12s = +\dfrac{1}{2}
  2. (2)n=3n = 3, ℓ=2\ell = 2, m=−2m = -2, s=+12s = +\dfrac{1}{2}
  3. (3)n=4n = 4, ℓ=1\ell = 1, m=0m = 0, s=+12s = +\dfrac{1}{2}
  4. (4)n=4n = 4, ℓ=0\ell = 0, m=0m = 0, s=+12s = +\dfrac{1}{2}

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See the full 4 Apr 2026, Shift 1 paper