Makes up 75 percent of the air and is found in the 15th group?

The gas that makes up approximately 75 percent of the air is nitrogen. It is a colorless, odorless gas and is primarily found in the atmosphere. Nitrogen belongs to Group 15 of the Periodic Table, which is also known as the nitrogen group, and includes elements like phosphorus, arsenic, and bismuth. Its inert nature makes it essential for many biological processes while being non-reactive in its diatomic form (N₂).