Oxygen is a chemical element with the symbol O and atomic number 7. Its electron configuration is 2 , 6. It is located in the second stage of the group IV element and phase table. Physics of Oxygen Physical religion: Oxygen is a colorless , odorless and tasteless gas. It is slightly soluble in water. However, this solubility is very important. Aquatic plants and animals breathe through the dissolved oxygen in the water. Chemical properties: Oxygen is a negative active element. Its scheme is two. It is a strong oxidizer. However, most of its reactions take place at high temperatures. It reacts strongly with various metals and non-metals to produce oxides.