# Oxygen

Oxygen : The earth shaped as lungs symbolizes how oxygen is necessary for animal and plant life and also represents that oxygen is found all over the world. Oxygen is also required for combustion; this is represented by the border colours which are the colours typically associated with fire. In its liquid or solid form, oxygen is light blue so this was chosen as the background colour.  Joseph Preistley — who is most often credited with discovering oxygen — is shown in the picture in the top right hand corner.

Artwork by Colleen Danner and Halie Gilmore; Teacher:  Mrs. Becker, Waterloo-Oxford District Secondary School, Baden, Ontario Canada

### Atomic properties*

Name:

Symbol:

Atomic number:

Atomic mass:

Melting point:

Boiling point:

Density:

Electronegativity:

Number of isotopes:

State:

Colour:

Classification:

Oxygen

O

8

15.9994 amu

-218.4°C

-183°C

0.001429 g/cm3

3.44

3

Gas

Colourless±

Non-metallic±

* Haynes, W. M. (2011). CRC Handbook of Chemistry and Physics, 91st edition: http://www.hbcponline.com/ Retrieved April 7, 2011

± Winter, M. (2010). Home of the Periodic Table. Retrieved April 8, 2011, from Web Elements: http://www.webelements.com/