Representation A covalent bond is drawn or represented in atomic and molecular diagrams using a short straight line. The uniting of two atoms of hydrogen in this way would be drawn H-H . Very frequently this is written H 2 . In some cases, atoms may share four electrons between them, forming a double bond . Or in some extreme cases two atoms can share 6 electrons forming a triple covalent bond between them.
Covalent bonds are directional.
Atoms are bonded together in preferred orientations relative to one another. Molecules, therefore, have definite shapes such as that seen in the bent structure of a water molecule. These covalent bonds are non-polar . Electrons shared between unlike atoms are not shared equally, one atom gets more of the common electrons and is thus slightly negatively charged. The other atoms gets less than a full share of the electrons and is thus slightly positively charged.