Consider the ground state of chromium atom $(\mathrm{Z}=24)$. How many electrons are with Azimuthal quantum…

Consider the ground state of chromium atom $(\mathrm{Z}=24)$. How many electrons are with Azimuthal quantum number $l=1$ and $l=2$ respectively ?
  1. 12 and 4
  2. 16 and 4
  3. 12 and 5
  4. 16 and 5

Solution

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

Asked in: JEE Main 2025 (04 Apr Shift 2)

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