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CBSE Class 11-science Answered

how does the electron enter in the 6th period??why does it first enter in 5d then in 4s????
Asked by karan bhatt | 26 Sep, 2013, 10:10: PM
Expert Answer
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.
Answered by | 27 Sep, 2013, 10:42: AM
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