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NI-TRO-GEN 
The second of the big three elements in row two is nitrogen. Nitrogen is the seventh element of the periodic table located between carbon and oxygen. Along with carbon and oxygen, it is essential in most of the compounds that allow life to exist. We'll tell you again later, but you should always know that almost eighty percent of Earth's atmosphere is made of nitrogen gas. Even though it surrounds us every day, it wasn't isolated until 1772 by Daniel Rutherford. It was named eighteen years later by the chemist Chaptal. Nitrogen is a clear gas that has no smell when it is in its pure form. It is not very reactive when it is in a pure molecule, but it can create very reactive compounds when combined with other elements including hydrogen (ammonia).
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