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OX-Y-GEN 
You're breathing right now and your body is taking in its needed oxygen molecules. You need oxygen to survive, as do all other living organisms. It’s a good thing that oxygen makes over twenty percent of the Earth's atmosphere. We are the only planet in the solar system with enough oxygen available to let us survive. Did you know that if you breathe too much oxygen you could die? What about this? If you have a room filled with oxygen and hydrogen and someone lit a match... It would explode! That's because oxygen is very reactive. Oxygen is the eighth element of the periodic table and found in the second row (period). Alone, oxygen is a colorless and odorless compound that is a gas at room temperature. Oxygen molecules are not the only form of oxygen in the atmosphere; you will also find oxygen as ozone and carbon dioxide. A chemist named Priestly isolated oxygen in 1774.
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