Thu September 26, 2013 By: Karan Bhatt

how does the electron enter in the 6th period??why does it first enter in 5d then in 4s????

Expert Reply
Fri September 27, 2013
Remeber two rules while filling electrons in the atoms:
  1. Orbitals are filled in the order of increasing n+l;
  2. Where two orbitals have the same value of n+l, they are filled in order of increasing n.
Where n = primary quantum number and l= azimuthal quantum number.
So, electron will enter in 6s and then in 5d.
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