although that proliferated in the Baroque art the mixed technique that we. call historical, and that combined with a grisaille after hardening usually. with a leaner tempera with warmer hues superimposed in glazes of oil. could eventually be qualified in mordant alternating lean and fat layers.
Because the electrons in ionic solids are localized (in the ions) these solids tend to be stiff and brittle like covalent solids. As solids they do not conduct electricity (again because of the localize electrons).However, they do conduct electricity as liquids (or when dissolved in water) since then the ions can move.istortion away from this geometry can only occur through a breaking of covalent sigma bonds. As a result, the melting point of covalent solids is extremely high. They also tend to be extremely hard substances that will break into pieces rather than smoothly change shape. We say that they are stiff and brittle.
Crystals fracture when they are subject to stress. http://en.wikipedia.org/wiki/File:Sodium... _______________________________________... Ionic compounds almost always consist of metals which are brittle.. Pure metals are malleable and are not very brittle.They are held together by a weaker bond called the metallic bond. You can't judge the properties of compounds by the properties of the atoms that make them up.Look at sodium chloride. Sodium is a highly reactive soft metal. Chlorine is a reactive poisonous gas.ure metals are malleable and are not very brittle. They are held together by a weaker bond called the metallic bond. You can't judge the properties of compounds by the properties of the atoms that make them up.