Is nitrogen a conpound

As an element is a pure substance which contains only one kind of atoms ,so nitrogen -N2,contains only one kind of atom which is nitrogen of two atoms. And compound is also a pure substance which contains two or more kind of atoms. ... So,nitrogen is an element not an compound.

The big glowy thing is called the sun it is a star in our galaxy and is over 1 million degrees

Shania is trying to determine the oldest geologic unit on this map and the reason to why is she unable to do so is that  the units are all the same age.. when there is the same age, there will be no oldest geologic unit and that i cannot be credible.