Write the electronic configurations of the elements with the atomic numbers $61, 91, 101$ , and $109.$

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Solution

$Z = 61 : {[X e]}^{54} 4 f^{5} 5 d^{0} 6 s^{2}$

$Z = 91 : {[R n]}^{86} 5 f^{2} 6 d^{1} 7 s^{2}$

$Z = 101 : {[R n]}^{86} 5 f^{13} 5 d^{0} 7 s^{2}$

$Z = 109 : {[R n]}^{86} 5 f^{14} 6 d^{7} 7 s^{2}$

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