Q: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
Question: The nitrogen:
Options: <0> It is a highly reactive gas at room temperature. <1> Nitrogen molecules are constituted by two atoms linked together by a single bond. <2> It has a higher reactivity than other isoelectronic molecules such as CO, CNo or NO +. <3> At a sufficient temperature, it reacts with H2 to give NH3. <4> It barely forms binary compounds with the rest of the elements of the Periodic Table.
A:
chemistry