Take the local train, Circumvesuviana, from the Sorrento Central train station to the Naples Central Railway Station. Sorrento is the last and first stop on its trip around the Gulf of Naples, so you don't have to worry about getting on a train in the wrong direction. Train fare costs about $5.50.
How elements are formed. Our world is made of elements and combinations of elements called compounds. An element is a pure substance made of atoms that are all of the same type. At present, 116 elements are known, and only about 90 of these occur naturally.
Most matter consists of elements combined with other elements in a set ratio or proportion called compounds. For example, water is a compound made of the elements hydrogen and oxygen. The ratio of these elements is two hydrogen atoms and one oxygen atom for each molecule of the compound water. Carbon dioxide gas is another example of a compound. Any sample of carbon dioxide is always made of part carbon to two parts oxygen (CO2). Salt, sodium chloride is made of one part sodium to one part chlorine (NaCl). When elements are combined to make a compound, the new substance has properties different from those of the original elements.