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  4. The number of electrons with azimuthal quantum number l = 1 and l = 2 for Cr in ground state are respectively

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Q. The number of electrons with azimuthal quantum number $l = 1$ and $l = 2$ for $Cr$ in ground state are respectively

KEAMKEAM 2015Structure of Atom

Solution:

Electronic configuration of

${ }_{24} Cr =1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 4 s^{1}, 3 d^{5}$

Given, azimuthal quantum number $(l)=1 \Rightarrow p$ -orbital azimuthal quantum number $(l)=2$

$\Rightarrow d$ -orbital. So, number of electrons in $p$ -orbital $=12$ and number of electrons in d-orbital $=5$.