A) \[[Rn]6{{d}^{2}},7{{s}^{2}}\]
B) \[[Xe]4{{f}^{1}},5{{d}^{1}},6{{s}^{2}}\]
C) \[[Xe]4{{f}^{14}},5{{d}^{1}},6{{s}^{2}}\]
D) \[[Xe]5{{d}^{1}},6{{s}^{2}}\]
Correct Answer: D
Solution :
Due to stability of the [Rn] core, the filling of\[5f\] orbitals does not begin until there are two electrons in the 6d-orbital and similarly, due to stability of the [Xe] core, the filling of\[4f-\]qrbitals does not occur until there is one electron in\[5d-\]oribital. As such, the only true d -block element is.
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