Oxygen
O2
Characteristics
Oxygen is a colorless and tasteless gas
It forms 21% of the atmosphere by volume and 23% by weight
It makes up one half of earth's crust and one fifth of the air we breath
It doesn't burn
It can also be a liquid and a solid
Uses
Oxygen is used to make different acids
Hot oxygen air is required to make iron and steel
It is also used to cut and melt metals
It is used in airplanes and cars
Some mining companies use it to destroy rocks
History
Oxygen was discovered in 1774
Before oxygen air was felt to be an element in its own right
It was prepared by workers before 1772 but they didn't recognize it as an element