# 论文代写：氧气的发现

#### 25/02/2018

The discovery of oxygen occurred in 1770 and not in 1850s. It is usually attributed and credited to Joseph Priestly. At the time of discovery of the oxygen, the notions and principles of chemistry were like alchemy. The people did not understand the concept of oxygen. They assumed that the world was made of air, earth and fire. The periodic table was not yet devised. In 1774, it was attributed that Priestley was discover oxygen. However, in 1772, Karl W. Scheele detailed the discovery of oxygen. He did not publish his findings until 1777. In the story, the retro-Nobel committee makes difficult determination for identifying the award for the discovery of oxygen. Carl Wilhelm Scheele, Joseph Priestley and Antoine Laurent Lavoisier were the three contestants who were considered for the title. Priestley had discovered a compound that causes combustion and Lavoisier tries to systematically classify the compounds. Nevertheless, Scheele is not considered as he had published his findings at a later data. Oxygen is a compound that has a number of important scientific implications. The discovery of Oxygen has caused the people to understand many of the important theories. The reason that the committees attribute the discovery to Priestly is that he published it at an earlier date and lays the foundation to other important theories. This is from a scientific perspective.