CHEM 10052 Lecture Notes - Lecture 4: Dmitri Mendeleev, Francium, Hemoglobin

• School: Kent State University
• Department: Chemistry
• Course: CHEM 10052
• Professor: Pritha Subramanian

Document Summary

Mendeleev: 1869: dimitri mendeleev published the first systematic ordering of the elements known at the time with respect to both mass and chemical properties. Others had published similar systems around the same time, but only mendeleev left deliberate blanks in his table and predicted the properties of these missing elements. These properties repeat themselves row to row: the rows (or periods) correspond to the main energy shells (n shells, columns are called groups , elements in the same group often show very similar chemical behavior. Metals left side of table: most elements are metallic, past uranium (92) are man-made, uses: lots! Non-metals: right side of table (+ hydrogen!: only 17 non-metals, h, c, n, o most important for life. Semi-metals: semi-metals or metalloids have properties intermediate between metals and non- metals, most important here are the semiconductors: si, ge, and as.