Oxygen -life saving element

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Oxygen-atomic Number-8.

In the discovery of oxygen 3 scientists give contribution.
1. Before 1604 - Michael sendivogius.
2. In 1773- carl wihelm.
3. 1774- priestly .

The name oxygen was given in 1777 by Antoine lavoisier.

By mass is the third most abundant element.  
Nasent oxygen is harmful ( O). It is useful when it is O2 ; dioxygen. It is colourless,odourless gas. Dioxygen constitutes 20.8% earth atomsphere. 
Naturally occurring oxygen is in form ( 16 O) isotope most abundant i.e.99.76%.

Another form of oxygen is ozone ( O3). Ozone helps us in protecting from ultraviolet radiation,harmful rays . It is basically umbrella of Earth.

Universe contains 'oxygen' at the rate of : 1%
Sun contains 'oxygen' at the rate of:0.9%
Oceans contains'oxygen'at the rate of:23%
Human body contains'oxygen'at the rate of:61%
The earth's crust consists of 'oxygen'at the rate of:46%
Meteorites consist of'oxygen'at the rate of:40%

Oxygen is regenerated by photosynthesis in plants.  So make tree plantation. 

Common uses of oxygen .
1. Life support system for all of us. Also
usedin aircrafts, sub Marines , space flight , hospitals..



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Liquid oxygen.

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