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  4. The electronic configuration of transition element 'X' is [.Ar].3d5 in its +3 oxidation state. What is its atomic number?

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Q. The electronic configuration of transition element $\_{}^{'}X_{}^{'}$ is $\left[\right.Ar\left]\right.3d^{5}$ in its +3 oxidation state. What is its atomic number?

NTA AbhyasNTA Abhyas 2022

Solution:

$Fe^{3 +}=\left[\right.Ar\left]\right.3d^{5}$
$_{26}^{}Fe=\left[\right.Ar\left]\right.3d^{6}4s^{2}$