can you just explain me the (n+l) situation.

Asked by  | 24th Jul, 2013, 12:13: PM

Expert Answer:

l here means the azimuthal quantum number( if l = o it means - s orbital, l = 1 means p orbital and l = 3 means d orbital)
say we have 4s orbital and 3d orbitals ;
In 4s the (n+l) would mean 4 + 0 = 4
In 3d it would mean 3 + 2 = 5 
the entity with the lower answer has lower energy and is filled first.
Thus 4s is filled before the 3d orbitals.

Answered by  | 24th Jul, 2013, 08:34: PM

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