Graphite- #41,#46, #53

Graphite- #41

Carbon can be used as a lubricant in the form of graphite.

Source:

http://www.grainger.com/Grainger/SLIP-PLATE-Dry-Powder-Graphite-Lubricant-1WVK9

Graphite- #46

Carbon has two stable isotopes and can exist as an ion.

Source:

http://www.buzzle.com/articles/isotopes-of-carbon.html

Graphite-#53

Carbon has two stable isotopes, 12C and 13C. 12C has 12 nucleons and 13C has 13 nucleons.

Source:

http://www.buzzle.com/articles/isotopes-of-carbon.html