14.1.2 The elemental substances of nitrogen family N2 is colorless and odorless gas.N2 is chemically inert.It will react directly with many metals (such as Li,Ca,Mg)when heated to give ionic nitrides.Nitrogen is also easily converted to a liquid (b.p,-195.8'C)and can dissolve in water slightly. N2 is colorless and odorless gas. N2 is chemically inert. It will react directly with many metals (such as Li, Ca, Mg) when heated to give ionic nitrides. Nitrogen is also easily converted to a liquid (b.p, -195.8°C) and can dissolve in water slightly. 14.1.2 The elemental substances of nitrogen family