CHEM 121 Lecture : Chemistry Textbook Notes
15 Mar 2019
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Chapter 1: background, chemistry: the study of the composition, properties, and transformation of matter, everything around you is made from elements. A russian chemist created the periodic table where he placed the elements in periods (rows) and groups (columns): each element in a single group has similar chemical properties. The periods and groups are named using letters and number (ex. Most of the nonmetals are gases, one is a liquid (bromine) and the other five are solids at room temperature. They are not silvery in appearance several are actually bright colored the solids are brittle and not malleable and poor conductors of heat and electricity: semimetals: are 7 of the 9 elements in the zigzag. There properties are between metallic and nonmetallic neighbors. Most are silvery in appearance and are solid at room temperature like metals but they are brittle and not good conductors like nonmetals: properties: any characteristic that can be used to describe or identify matter.
