PROPERTIES N2 is a nonmetal, which under extreme pressure, different allotropes (N3 and N4)can be produced. N2 condenses (liquefies) at ?195.79 C and freezes at ?210.01 C. REACTIONS In general, nitrogen is unreactive at standard temperature and pressure. N2 reacts spontaneously with PLSM and FIRE, being resilient to ACID PHASES liquid- LN02 (liquid nitrogen, existing element) gas- N2 solid- NICE (nitrogen ice, existing element)