The atoms form positive and negative ions which attract to each other. Ionic compounds are composed of large numbers of positive ions (cations) and negative ions (anions) so that the amount of positive charge equals the negative charge. In covalent bonds the electrons are shared between two bonded atoms.
4. Try doing a gradation of color by selecting a shirt and tie that are the same color, but in lighter or darker shades. For example, pair a light blue dress shirt with a medium blue tie. 5. For business interviews and important meetings, keep your tie color classic and conservative.
Time of Day. As explained in Etiquette: Formal Tradition, black tie and white tie are categories of evening wear and evening wear is not meant to be worn before six oclock or before dark, whichever comes first. Therefore, formal weddings that take place during the day traditionally require morning dress, the daytime equivalent of evening wear.