Nitrogen
From Simple English Wikipedia, the free encyclopedia
Nitrogen is a nonmetal chemical element. It has the chemical symbol N and atomic number 7. It has 5 electrons in its outermost shell.
Air is made up of about 80% nitrogen and about 20% oxygen.
Nitrogen is not poisonous. We can safely breathe it when it is a part of air, but we cannot breathe pure nitrogen by itself, because it does not have the oxygen that we need to live.
Nitrogen is formally considered to have been discovered by Daniel Rutherford in 1772, who called it noxious gas or fixed gas.
