One evening last summer, as I strolled along the promenade in Limbe, a small, scenic port town in southwestern Cameroon, I was stopped by a well-dressed young man who greeted me warmly and took me by the hand.
Phosphorus has 3 shells. The outer shell contains 5 electrons. The electronic configuration is :- <br /> 1s2, 2s2, 2p6, 3s2, 3p3.
Premise - The element calcium has the identical electron configuration of its inner shells as argon contains in its full shell. The electron configurations will fill in electrons according to the arrows in the diagram. Note that they do not fill in exact numerical order, but by the energy of the individual electrons.