 1280 - Albertus Magnus died: discovered arsenic (As, 33); first to use the term affinity in the chemical sense; better known today as a Catholic saint and scholastic philosopher |
| 1810 - Humphry Davy names chlorine (Cl, element 17). Chlorine had been called oxymuriatic acid. |
| 1887 - Carl Gassner, Jr. receives US patent 373,064 for a dry cell battery. |
sources: http://webserver.lemoyne.edu/faculty/giunta/week.html, http://todayinsci.com
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