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.
Sunburn causes a reddened, irritated area of skin caused by overexposure to the sun's rays or other UV light. Migraine headache (adult) Migraines are a common type of headache that can cause severe pain, aura or flashes in vision, and tingling. Nearsightedness. Nearsightedness is a common eye problem that causes blurry, distant vision. Depression (Adult)