why does the the added electrons fill the penultimate shell, why not the ultimate shell?

Asked by Pooppy pooppy | 20th Dec, 2013, 01:00: PM

Expert Answer:

  • Any of the metallic elements within Groups 3 to 12 in the Periodic Table that have an incomplete inner electron shell (d orbital) are called transition elements.
  • Due to incomplete penultimate shell (d orbital), and completely filled outermost shell (s orbital), the incoming electron enters the penultimate shell to acquire stable configuration (either completely filled or half filled d orbital).
  • Hence in case of transition elements, the added electrons fill the penultimate shell, and not the ultimate shell.  

Answered by Prachi Sawant | 20th Dec, 2013, 04:11: PM

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