I was searching about crystal structure of metals and I found this from our AAC e-book ,
Chapter 3 : http://www.allaboutcircuits.com/vol_3/chpt_2/3.html
Nice book
Chapter 3 : http://www.allaboutcircuits.com/vol_3/chpt_2/3.html
I think it will be K shell as L shell contains total 8 electrons ,2 in s orbital and 6 in p orbitals.It is these electrons which participate in chemical reactions with other elements. An over simplified chemistry rule applicable to simple reactions is that atoms try to form a complete outer shell of 8 electrons (two for the L shell).
Nice book