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unit cell |
| the smallest group of particles within a crystal that retains the geometric shape of the crystal |
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| June 22 in chemistry |
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 1799 - The first standards for the meter and kilogram (the first standards in the international system (SI) of units) are deposited in the National Archives of France. |
| 1892 - N. Howell Furman born: analytical separation of uranium. |
| 1903 - Harry Julius Emeléus born: inorganic chemistry, fluorine chemistry. |
sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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