OXYGEN: Joseph Priestly discovered oxygen in 1774. Oxygen is obtained from liquid air. Its name comes from the Greek words oxus (acid) and gennan (generate). Its melting point is 218.4*C and its boiling point is 183.0*C. Oxygen has 8 protons, 8 electrons, and 8 neutrons. Oxygen is a non-metal and its crystal structure is cubic. Its density at S.T.P. is 1.429g/cm3, and it is a colorless element. The element Oxygen has 2 energy levels. In the first there are 2 electrons, and in the second there are 6. Oxygen is the second most common element on Earth, composing around 49% of the mass of Earths crust and 28% of the mass of Earth as a whole, and it is the third most common element in the universe. On Earth, it is usually covalently or ionically bonded to other elements. The atmospheric abundance of free oxygen has been largely driven by photosynthetic organisms; roughly three quarters of the free element being produced by algae in the oceans, and one quarter from terrestrial plants. Oxygen is a ......

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