3rd Period: Sodium to argon—Electrons go into the third energy level. After the third energy level has 8 electrons, the next electron goes into the fourth level. 4th Period: Potassium and ...

A Lewis Acid is an electron pair acceptor and a Lewis Base is an electron pair donor. The oxalate anion is donating electrons to the vacant 3d and 4s orbitals on iron. The potassium and chloride ions ...