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Oxygen: Element Poster Project
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Oxygen
- Symbol name: O
- Atomic number: 8
- Atomic mass: 15.9994
- Electron confiruration: 1s 2 2s 2 2p 4
- Isotopes: Oxygen-15, oxygen-16
The discovery of oxygen was first found by a Swedish chemist named, Carl Wilhelm Scheele in the year of 1772. The second person to discover oxygen was an independent English chemist, in 1774, 2 years after Carl first discovered it.
Carl Wilhelm Scheele discovered that red-hot manganese oxide produces a gas. He called the gas "fire air" because of the brilliant sparks it produced when it came in contact with hot charcoal dust. He repeated this experiment by heating potassium nitrate, mercury oxide, and many other materials and produced the same gas. He collected the gas in pure form using a small bag. He explained the properties of “fire air” using the phlogiston theory, which was soon discredited by Lavoisier. He carefully recorded his experiments in his notes, but waited several years before publishing them.
Chemical Properties
- Flammable? No, oxygen is not flammable because it is not a fuel.
- Combustible? No, oxygen is not combustible. Combustion occurs when a substance reacts with oxygen. Since oxygen atoms can't make anything but oxygen, it is not combustible.
- Corrosive? Oxygen is not corrosive because it does not eat away at other materials. If oxygen was corrosive, then there would be nothing here!
- Density: 1.429 g/cm
- Melting point: -218.350006 C
- State of matter: Gas
- Classification: Non-metallic
- Crystalline structure: Cubic
- Hardness-Mohs-Mineral: No one has
found the hardness yet.
Fun Fact!
Oxygen is the third most abundant element in the universe. It makes up 21% of the world.
Sources:
- http://www.webelements.com/
- http://www.chemicalelements.com/
- http://wiki.answers.com/Q/Is_oxygen_combustible
Periodic Table
Bohr Model
Discovery
Carl Wilhelm Scheele
Physical Properties
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o