Which one is more reactive between chlorine and nitrogen and why?

chlorine.

Cl2 is a single bond; N2 is a triple bond. Cl has just 1 electron to add to make an octet and it forms an ionic bond. N needs 3e to make an octet and few N compounds are ionic; i.e., most are covalent.

To determine which element is more reactive between chlorine (Cl) and nitrogen (N), we need to consider their positions in the periodic table.

Chlorine is located in Group 17 (Group VIIA), also known as the halogens. Halogens are highly reactive elements due to their strong tendency to gain one electron and achieve a stable electron configuration.

Nitrogen, on the other hand, is located in Group 15 (Group VA). Nitrogen is a non-metal and, unlike the halogens, it does not have a strong tendency to gain electrons. It prefers to share electrons in covalent bonding to achieve a stable configuration.

Based on their positions in the periodic table, chlorine is more reactive than nitrogen. Chlorine readily reacts with other elements to gain one electron and achieve a stable electron configuration, while nitrogen tends to form covalent bonds rather than gaining electrons.

So, to answer your question, chlorine is more reactive compared to nitrogen because of its position in the periodic table and its stronger tendency to gain electrons.