What are the origins of the word Oxygen ?
The name originates from the Greek words gennan meaning 'generate' and oxus meaning 'acid' - so named because it was believed that all acids contained oxygen.

Facts about the Classification of the Element Oxygen
Oxygen is classified as an element in the 'Non-metals' section which can be located in groups 14,15 and 16 of the Periodic Table. Non-metals are not easily able to conduct electricity or heat and do not reflect light . Non-metallic elements are very brittle, and cannot be rolled into wires or pounded into sheets. Non-metallic elements exist, at room temperature, in two of the three states of matter : gases (such as oxygen) and solids (such as carbon).

Brief Facts about the Discovery and History of the Element Oxygen
Oxygen was discovered by Carl Wilhelm Scheele in Sweden in 1771 and then by Joseph Priestley in 1774. It was named by Antoine Laurent Lavoisier in 1774.

Occurrence of the element Oxygen in the Atmosphere
Constitutes 21 percent of the atmosphere
Found in water, in most rocks and minerals, and in numerous organic compounds
Oxygen comprises about 87% by weight of the oceans as H2O - water

Common Uses of Oxygen
Oxidizer
Rocket propulsion
Medicine
Welding
Oxygen sensors
Oxygen mask
Oxygen concentrator

The Properties of the Element Oxygen
Name of Element : Oxygen
Symbol of Oxygen Element : Ar
Atomic Number of the element Oxygen : 18
Atomic Mass of Oxygen : 39.948 amu
Oxygen Melting Point: -189.3 °C - 83.85 °K
Oxygen Boiling Point: -186.0 °C - 87.15 °K
Number of Protons/Electrons in Oxygen : 18
Number of Neutrons in Argon : 22
Crystal Structure of Oxygen Element : Cubic
Density @ 293 K: 1.784 g/cm3
Color of Argon : Colorless