The shared valence electrons between two nonmetal atoms is called a covalent bond. Covalent bonds are formed when two atoms begin sharing electrons. The electrons are attracted to the positively charged nuclei of the atoms. A dipole results when electrons in a covalent bond are not shared evenly between the two atoms.ovalent bonds are formed when two atoms begin sharing electrons. The electrons are attracted to the positively charged nuclei of the atoms. A dipole results when electrons in a covalent bond are not shared evenly between the two atoms.
Low blood pressure, often caused due to dehydration is another cause of faintness and light headed feeling. Episodes of light headedness often trigger in summers or on exposure to high temperatures are linked with dehydration and fall in blood pressure.
Vertigo is a big culprit in the causes of dizziness and lightheadedness, which can be a result of inflammation of the inner ear or a symptom of a disease that involves excessive fluid buildup in the inner ear. Many prescription medications have dizziness and lightheadedness as a side effect. While there are many possibilities, the more common causes of dizziness and lightheadedness are sudden dramatic drops in blood pressure, low iron levels, low blood sugar and dehydration.