Question

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

Answer 1

$Z=61:{\left[Xe\right]}^{54}4f^{5}5d^{0}6s^2$

$Z=91:{\left[Rn\right]}^{86}5f^{2}6d^{1}7s^2$

$Z=101:{\left[Rn\right]}^{86}5f^{13}5d^{0}7s^2$

$Z=109:{\left[Rn\right]}^{86}5f^{14}6d^{7}7s^2$