Oxygen You will find oxygen in the periodic table as O8. The symbol is O and the atomic number is 8. Oxygen weighs 1 5.9994. Oxygen was discovered in 1774. It is in the non-metal group and Chakgen group.
Oxygen is colorless and is non flammable.
It is used in rocket fuel, air, and it comes from trees, grass, and plants. Oxygen will not react with air, other gases, and plants. It is 5.7 log of the earth s crust and is 7.377 of the solar system. Helium You will find helium as He2. The atomic number is 2 and the symbol is He.