Corinthian order with a continuous design or left plain, as at the U.S. Capitol extension ("illustration, right"). At the Capitol the proportions of architrave to frieze are exactly 1:1. Above that, the profiles of the cornice moldings are like those of the Ionic order. If the cornice is very deep, it may be supported by brackets or modillions, which are ornamental brackets used in a series under a cornice. The Corinthian column is almost always fluted, and the flutes of a Corinthian column may be enriched. They may be filleted, with rods nestled within the hollow flutes, or stop-fluted, with the rods
Ionic bonding cannot exist, as the proximity of the entities involved in the bonding allows some degree of sharing electron density between them. Therefore, all ionic bonding has some covalent character. Thus, bonding is considered ionic where the ionic character is greater than the covalent character. The larger the difference in electronegativity between the two types of atoms involved in the bonding, the more ionic (polar) it is. Bonds with partially ionic and partially covalent character are called polar covalent bonds. For example, Na–Cl and Mg–O interactions have a few percent covalency, while Si–O bonds are usually ~50% ionic and ~50% covalent.