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Atomic symbol O
Atomic number 8
Classification Non-metal
Atomic mass 15.994 amu
Other Information
Date of discovery 1774
Name of discoverer Joseph Priestley
Name origin From the Greek words oxus (acid) and gennan (generate)
Uses Supports life
Obtained from From liquid air

Oxygen is the third most abundant element in the universe by mass and is essential to life on Earth.

Chemical Properties

At normal atmospheric pressure oxygen melts at 54.36 Kelvin (K) and boils at 90.2 K; on Earth it essentially exists only as a gas. It readily dissolves in water, which makes aquatic life possible. Under normal conditions oxygen forms molecules consisting of two oxygen atoms each sharing two electrons in the 2p subshell; this form of oxygen is known as O2. O2 is a pale blue odourless gas.