Atoms on the Right Hand Side of the periodic table - Carbon, Phosphorous, Chlorine itself etc
It happens when substances share electrons between them in order to get extra stability.
The Noble gases.
There are too many combinations of atoms to list as polar covalent. To help you out: Molecular bonds can be classified in different ways depending on the attractions between electrons and nuclei....
Any two of the elements found on the right side of the periodic table of elements. The non-metal elements.