為甚麼氮測試不到??

氮氣由氮分子（N2, N≡N）組成。由於氮分子由兩個氮原子以三鍵連在一起而成，而三鍵非常強，所以氮氣非常穩定，只有極少數目的反應。在現行會考（甚至高考）的課程中，並不包括氮氣的任何反應，所以在會考課程中氮氣並不包括氮氣的測試。

事實上，氮氣的測試如下：
把燃燒中的鎂條放入氮氣中，鎂條會繼續燃燒，表面生成灰黃色的固體（氮化鎂）。
3Mg(s) + N2(g) → Mg2N2(s)
把這灰黃色的固體與水反應，會釋出具辛辣氣味的氨氣。
Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(s) + 2NH3(g)
=

My Chemistry knowledge is up to AL...
According to CE and AL syllabus, nitrogen has no reaction and test.
But i think it can be tested when u study in University (i guess).
It is because the size of nitrogen is very small. Two small nitrogen atoms bond together to form N2. In addition, the bond order of nitrogen is three. It require large amount of energy to break the bond between two nitrogen atoms. As a result, there are no tests for nitrogen. The bond enthalpy is very high compare with oxygen and other gases in the same period.