Question

The electronic configuration of ${}_{59}Pr$(Praseodymium) is?

• A. ${[}_{54}Xe]4f^{2}5d^{1}6s^2$
• B. ${[}_{54}Xe]4f^{1}5d^{2}6s^2$
• C. ${[}_{54}Xe]4f^{3}6s^2$
• D. ${[}_{54}Xe]4f^{3}5d^2$

Answer 1

The correct option is C ${[}_{54}Xe]4f^{3}6s^2$

The expected (idealized) electronic configuration of ${}_{59}Pr$ (Praseodymium) is ${[}_{54}Xe]4f^{2}5d^{1}6s^2.$

The observed electronic configuration of ${}_{59}Pr$ (Praseodymium) is ${[}_{54}Xe]4f^{3}5d^{0}6s^2.$

Note: Praseodymium is a lanthanoid.