Fast facts and key data
Artwork: The periodic table of chemical elements showing the position of chromium. It's a relatively light element (near the top of the table) among the transition metals, in the same group as molybdenum (Mo) and tungsten (W).
- Discovered: 1797, Louis Vauquelin (1763–1829).
- Melting point: ~1,900°C (3,465°F).
- Boiling point: ~2,670°C (4,840°F).
- Atomic number: 24 (one chromium atom contains 24 protons, 27 or 28 neutrons, and 24 electrons).
- Relative atomic mass: 51.99.
- Density: 7.19 g/cc.
Find out more
On other sites
- USGS Minerals: Chromium Statistics and Information: Detailed and definitive information about world chromium production and trends.
- Learn Chemistry: Microscale Chemistry - Chromium, molybdenum and tungsten: A 10-minute experiment to compare chromium with two other transition elements.
Books for younger readers
- Chromium by Greg Roza. Gareth Stevens 2014/Rosen, 2008. A slightly longer (48-page) intro, with a bit more about the history of chromium.
- The Elements: Chromium by Nathan Lepora. Marshall Cavendish/Benchmark Books, 2005. A basic 32-page introduction, most suitable for readers aged 9–12.
Books for older readers
- Chromium in the Natural and Human Environments by Jerome O. Nriagu and Evert Nieboer (eds). Wiley Interscience, 1988. A comprehensive review of chromium's environmental and health effects.
- From One Mineral, Brilliant Reds and Bright Blues by C. Claiborne Ray. The New York Times, 22 June 2018. A short explanation of how chromium gives the characteristic red color to ruby gemstones.
- Chromium in dietary supplement can convert to carcinogen, study finds by Australian Associated Press, The Guardian, 11 January 2016. Researchers flag up potential health risks of using vitamin tablets containing high doses of chromium.
- Chromium by GrrlScientist, The Guardian, 12 August 2011. Exploring the colorful world of chromium.
- Better Cleanup Planned at Former Chrome Plant by Mireya Navarro. The New York Times, 5 April 2011. How local citizens in Jersey City, Hudson County, campaigned to get the contaminated site of a chromium plant cleaned up properly.
- Warning over vitamin doses: BBC News, 7 May 2003. A food watchdog issues a warning over a chromium compound used in vitamin supplements.