Element with outer shell electronic configuration for is

Question

Element with outer shell electronic configuration  for  is

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Strategy:
 Use the given general configuration and substitute the value of  to find the element.

Step 1: Substitution ()

The configuration is: .

Step 2: Identify the element
- Adding this to the Xenon core: .
- Total electrons: .
- The element with atomic number  is Gadolinium (Gd).
- Note: The  electron appears because the half-filled  subshell is exceptionally stable.

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