Pushing Arrows guidelines part 2

If electrons move from  

•  a σ-bond to one of the bonded atoms, the σ-bond is broken. 
  Two fragments result if the bond was NOT part of a ring.  
  Electron movement is
  toward the atom at the head of the arrow. 

  This atom gains ownership of one more electron and the charge at this atom becomes one unit more negative.
  away from the other atom of the bond.

  This atom owns one fewer electrons and the charge at this atom becomes one unit more positive.
   
  
• a π-bond, that bond is broken.
  No fragmentation occurs because the atoms are still joined by a σ bond.
  
   
• an atom having a nonbonding pair, a new bond forms. The new bond may be 
  • a π bond if a σ bond is already present (as shown just above) or
  • a σ bond if the atom at the tail of the arrow and the atom at the head of the arrow were not previously bonded to one another.
     

The charge on the atom that loses electron ownership (at the tail of the arrow) is one unit more positive in the product.

The charge on the atom that gains electron ownership (at the head of the arrow) is one unit more negative in the product.