Another name for the representative elements is the "A elements." These elements are found within the first two families and last six families of the Periodic Table.Continue Reading
The representative elements are found in Groups I and II, which are on the left side of the Periodic Table, and Groups III through VIII on the right side of the table. These elements include the alkali metal group, alkaline earth metals and chalcogens.
The elements in each group share the same characteristics. For example, alkali metals are soluble in water and easily cut with a knife. Alkaline earth metals are harder than alkali metals, and they are not as reactive with oxygen.Learn more about Atoms & Molecules
Lead is one of a handful of elements which were known from ancient times; thus, it was never formally discovered. In fact, alchemists considered lead the oldest metal.Full Answer >
Helium is a gas that is colorless, odorless and does not react with other elements under normal circumstances. Scientists classify helium as a noble gas.Full Answer >
Carbon is considered tetravalent because it has four electrons available to form chemical bonds with other elements. These electrons are called valence electrons and are located in the outermost electron shell.Full Answer >
Table salt is an ionic compound composed of the elements sodium and chlorine, in equal proportions. The chemical symbol for this compound is NaCl, and it is an essential nutrient for human beings and many other animals.Full Answer >