If the bone represents the electron that is up for grabs, then when the big dog gains an electron he becomes negatively charged and the little dog who lost the electron becomes positively charged. Covalent bonds can be thought of as two or more dogs with equal attraction to the bones. Since one dog does not have more of the bone than the other dog, the charge is evenly distributed among both dogs. These bonds can be thought of as two or more dogs that have different desire for bones. The bigger dog has more strength to possess a larger portion of the bones.
Sharing still takes place but is an uneven sharing.
This allows the electrons to move through the substance with little restriction. The Science Zone was made for the Ithaca City School District by Science Joy Wagon . No portion of this site may be copied without written permission.