We All Need It!
Atomic Number: 8
Atomic Weight: 15.9994
Oxygen is a colorless, odorless gas.
- Discovered by Joseph Priestly, but also was reported independently by Carl Wilhelm Scheele
- Comes from Greek words "oxy genes"
- Air used to be considered as one element, but Leonardo da Vinci suggested it was atleast two, and one was flammable while the other supported life.
- Behavior of nitrogen and oxygen as parts of air led to the Phlogiston Theory of Combustion
- Found in water (H2O) and is necessary for life
- Makes up most of the weight of water
- Most organisms use oxygen for respiration
- About two thirds of the human body is oxygen
- Widely used for medical purposes
Oxygen is in water and is used for breathing, both essential to all life.
- Makes up 21% of the atmosphere
- Third most abundant element on the sun
- In the atmosphere, protects us from harmful UV rays of the sun
- Involved in the carbon-nitrogen cycle, responsible for stellar energy
- Most abundant element in the Earth’s crust
- Boiling point: -182.9 degrees Celsius
- Melting point: -218.3 degrees Celsius
- 8 electrons
- Shell structure is 2.6
- Oxygen as ozone (O3) is highly toxic
- It causes the bright red and yellow green colors of the aurora
- Liquid and solid forms of oxygen are pale blue