nitrogen
Group 15 of the periodic table is also called the nitrogen group. The first element in the group is the nonmetal nitrogen N , followed by phosphorus P , another nonmetal. Arsenic As Figure below and antimony Sb are the metalloids in this group, and bismuth Bi is a metal. All group 15 elements have five valence electrons, but they vary in their reactivity. Nitrogen, for example, is not very reactive at all, whereas phosphorus is very reactive and found naturally only in combination with other substances. All group 15 elements are solids, except for nitrogen, which is a gas.