Salt is made up of two elements:Sodium and Chlorine. Sodium is a metal. Chlorine is a non metal. These two elements can be found on the periodic table of element. The periodic table of element is a table that shows all the elements that known by mankind. The periodic table is arranged in the order of their atomic weights and their atomic numbers, are shown in related groups. The periodic table is arranged by eight columns and seven rows. Each row of the periodic table is known as a period. Each column in the periodic table is known as a group. In the periodic table there alkali metals, alkaline earth metals,transition metals, metalloids, nonmetals, halogen and noble gases. Alkali metals tend to be less dense than the other metal, highly reactive, and low ionization. Alkaline earth metals have only two electrons in the valence shell, low melting point and low boiling point. Transition metals have a high melting point, high boiling point and they have low ionization energy. Metalloids are very dense, semiconductors, and ionization is intermediate. Nonmetals are poor electrical conductors, has high ionization energy, and tend to form brittle solids. Halogens are very reactive, have seven electrons in the valence shell, have low melting and boiling point. Noble gases have complete valence shell, have low reactivity and very good conductors. A valence shell is the outer shell of any atoms. Usually an atom tend to be less reactive when a valence shell is full.