Q24 / 75 · JEE Main 2025 (4 Apr Shift 2) · Chemistry

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

  • A
    12 and 4
  • B
    16 and 4
  • Correct answer
    C
    12 and 5
  • D
    16 and 5

Solution

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

Hence, the correct answer is option: 'C'.

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