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JEE Main 20254 AprilEvening Shift
Exam
JEE Main
Year
2025
Date
4 April
Shift
Evening Shift
Subject
Chemistry
Chapter
Structure of Atom

JEE Main 2025 · 4 April · Evening Shift · Chemistry · Structure of Atom

Consider the ground state of chromium atom (Z=24) . How many...

Consider the ground state of chromium atom (Z=24)(\mathrm{Z}=24). How many electrons are with Azimuthal quantum number l=1l=1 and l=2l=2 respectively ?

Options

  1. A12 and 4
  2. B16 and 4
  3. C12 and 5
  4. D16 and 5

Correct answer

C. 12 and 5

Step-by-step solution

Cr:1s22s22p63s23p63d54s1ℓ=1ℓ=1ℓ=2 electrons having ℓ=1⇒12 electrons having ℓ=2⇒5\begin{aligned} & \mathrm{Cr}: 1 \mathrm{ s}^2 2 \mathrm{ s}^2 2 \mathrm{p}^6 3 \mathrm{ s}^2 3 \mathrm{p}^6 3 \mathrm{ d}^5 4 \mathrm{ s}^1 \\ & \ell=1 \quad \ell=1 \quad \ell=2 \\ & \text{ electrons having } \ell=1 \Rightarrow 12 \\ & \text{ electrons having } \ell=2 \Rightarrow 5\end{aligned}
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