§14.1 The elements of nitrogen family 14.1.5 The compounds of As, Sb and Bi 14.1.4 The compounds of phosphorus 14.1.3 The compounds of nitrogen 14.1.2 The elemental substances of nitrogen family 14.1.1 Outline on nitrogen family §14.2 The elements of oxygen 14.2.3 Sulfur and the related compounds 14.2.2 Oxygen and the related 14.2.1 Outline on oxygen family