CHEM 105 1st Edition Lecture 2 Outline of Last Lecture • Average Atomic Mass • To understand the meaning of a weighted average, consider the masses and natural abundances of the three istopes of neon in the table to the left. • Calculating an Average Atomic Mass Outline of Current Lecture • The Periodic Table of the Elements • The modern periodic table contains seven horizontal rows called periods • 18 Colums called groups or families.Current LectureYou must know the names and symbols for:• All main group elements• All of the first row transition metals (Sc-Zn)• Group 1B (11) [Cu, Ag, Au]• Group 2B (12) [Zn, Cd, Hg]• The ions on pages 15 and 16 of the lab manual• Binary and oxyacids• ionic compounds• binary covalent compoundsQ: What is the symbol or formula for: bismuth Bithallium Tlammonium NH4thiocyanate SCN-acetate C2H3O2- or CH3COO-sulfuric acid H2So4hydrocyanic acid HCNdisilicon hexafluoride Si2F6Q: Name the following:Sb AntimonyK PotassiumAg+ SilverMnO4 Permangante NO2 Nitrogen dioxidePCl3 Phosphours tri HBr Hydrogen bromide H2CO3
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