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.
First shell contains 2 electrons since it can hold only 2 electrons, then the second shell can hold only 8 electrons, so it contains 8 electrons in second shell. Third shell can hold 18 electrons, but it contains only one electron, since it has 1 electron remaining.