These exercises are not divided by category, | Ch 2 - 99AE

Chemistry 1A Week 2 Lecture 3 Periodic Table 3 elements recently found in June • one found in Japan (113) • one found in Russia (115) • one found in Texas (117) Facts • Nobel gases weren’t originally on the table • Periodic table changed science from observational to actually going out and looking for information and data • elements that are arranged by increasing atomic # • vertical rows are called periods, horizontal rows are all periods • groups 1, 2, 13-18 are the main group Group 1: alkali metals are very reactive in water; changes colors, dissolves, lustrous, and low melting temperature Group 2: alkali earth metals are similar to G1 but less reactive Groups 3-11: transition metals are transitional in character between the vigorously reactive metals in the s block and the less reactive metals on the left side of the p block Group 17: halogens are nonmetals, very reactive with alkali/A. E. metals Group 18: noble gases are colorless, odorless, gasses, and inert due to their full octets Metals: conducts electricity, has a luster, is malleable, and is ductile Nonmetal: does not conduct electricity and is neither malleable nor ductile Metalloid: has the appearance and some properties of metals but behaves chemically like a nonmetal Ion: atoms lose or gain electrons until they have the same number of electrons as the nearest noble gas atom Cation: a positive charged ion formed by elements on the l