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.
1. White-tie and black-tie. White-tie is the most formal look for men; it includes a formal tailcoat, a white vest, and a white tie. Black-tie is slightly less formal; men can simply wear a tuxedo, and should take the black tie part literally, wearing an actual black tie (and vest or cummerbund).