CHEM 145 Chapter 3: Chemical Bonding
14 Sep 2016
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Chem 145 chapter 3 chemical bonding: the classic description. Compounds that have the same molecular formulas but different molecular structures are called isomers. Chemical properties of the elements are periodic functions of the atomic number. 8 groups of representative elements + 10 groups of transition metal elements + rare- earth or lanthanide elements z from 57 to 71 (including those num. s) + actinide elements z from 89 to 103 (same) Alkali metals: soft metals, low melting points, react violently with water to release hydrogen (k, rb, cs set hydrogen on fire with energy released) Bromine in liquid at room temp. and iodine is solid. Alkali metal combined with a halogen is alkali halide. Boron in metalloid, while rest of iiia is metal. Tin and lead (iva) are metals with low melting points. Silicon and ge are metalloids, semiconductors: they form the base of modern semiconductor industry, manufacturing computer chips.
