On thebasisof symmetry (n-a) d^(4) ns^(2) and (n-1) d^(9) ns^(2) configurationsare lessstableand immediately changeover to thecorresponding more stable(n-1) d^(5) ns^(1)" and" (n-1) d^(10) ns^(1) configurations .Arethereany exceptions to thisgeneralization ? Comment

On thebasisof symmetry (n-a) d^(4) ns^(2) and (n-1) d^(9) ns^(2) confi

1.	On thebasisof symmetry (n-a) d^(4) ns^(2) and (n-1) d^(9) ns^(2) configurationsare lessstableand immediately changeover to thecorresponding more stable(n-1) d^(5) ns^(1)" and" (n-1) d^(10) ns^(1) configurations .Arethereany exceptions to thisgeneralization ? Comment
Answer» Solution :The are many excetions to THISGENERALIZATION . Someof these are : `{:("Name of the element","ATOMIC NUMBER","Expected EC ","Actual EC"),("1. Tungsten (W) ",74,[Xe] 4f^(14) 5d^(5) 6s^(1),[Xe] 4f^(14) 5d^(4) 6s^(2)),("2.Platinum (Pt) ",78,[Xe] 4f^(14) 5d^(10) 6s^(0),[Xe] 4f^(14) 5d^(9) 6s^(1)),("3. Seaborgium (Sg) ",106,[Rn] 5f^(14) 6d^(5) 7S^(1),[Rn] 5f^(14) 6d^(4) 7s^(2)):}`