The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. This one is about number 7 on the periodic table: nitrogen. It's the most abundant element in Earth's atmosphere.
Ammonia is one of the most widely produced chemicals in the world. It is used as fertilizer and in our homes, we can use a solution of ammonia in water to clean glass and other surfaces. This is probably why we are familiar with its characteristic pungent smell.