Several of the nonmetals are gases in their elemental form. Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2).
Uruguay became independent of Spain in 1811 and was annexed by Brazil until 1825. Following a three-year federation with Argentina, Uruguay became an independent nation in 1828. Thirty years later, the United States established diplomatic relations with Uruguay and the two nations have since maintained close ties.