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 The classic black suit with a white shirt should be worn with a light-colored necktie with a small pattern.  A single colored shirt goes well with a patterned tie. A large pattern makes a tie less formal, and itâs more suitable for a company of good friends.