Show how to convert cyclopentene into these compounds.(a) trans-1,2-Dibromocyclopentane

History ofthePeriodic Table -summarize periodic properties of elements -arranged by increaseofatomic mass -Mendeleev (Russian)andMeyer (German) in 1869 -Noted repeated periodic properties MODERN PERIODIC TABLE -arranged by increasing atomic number -rows calledperiods -columns calledgroups Noticed Trends -when arranging elements based on atomic number, trends started to appear -placedsimilarlybehaved elements in vertical columns 1A: alkali 2A: Alkaline Earth 7A: Halogens 8A: Noble Gases 6A: Chalcogens metalloids: 8 elements semiconductors properties similarto both nonmetals and metals Nonmetals: *THIS INCLUDESHYRDROGEN* Liquid, gases,andsolids Non-conductor of heat and electricity Insulators Usuallyin compounds or mixtures react with metals metals: metallic luster ductile high electrical andheat conductivity allare solidsat roomtemp.EXCEPTHg Transition Metals:Group B Multiple Charges Inter-transition metals:Radioactive Actinide elements (#90-103) Lanthanide elements (#58-71) Periods: horizontal Groups:vertical Group A: outsides (main group) Group B:middle (transition metals) Metals: leftsideof periodic table Nonmetal: right sideof periodic table (and H) Moleculesand Molecular Compounds FUN FACTS: OnlyNoble gases arefound isolatedin nature Molecules are assembledof two or more atoms tightly bound together You write them in chemical formulas! ChemicalFormulas Usethe Chemical symbol Indicates which atoms arefound inthe molecule and what proportion they