Element with outer shell electronic configuration for is

Question

Element with outer shell electronic configuration  for  is

Canvas Classes · Accepted Answer

🧠 Substituting  gives  — that is Gadolinium
The general formula  with  gives: , , .

🗺️ Identify the element
Configuration: .
Total electrons .
Element 64 is Gadolinium (Gd).

Note: The  appears because the half-filled  is exceptionally stable. Filling  would break this stability, so one electron jumps to  instead — same logic as Cr and Cu in the -block.

⚠️ Common mistake
Uranium () has the  series active and a different electron configuration entirely. Don't confuse -block configurations at

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