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Introduction to the Periodic Table Dmitri Mendeleev made the _________________________________ What is the PERIODIC TABLE? oShows all known ________________ in the ______________________. oOrganizes the elements by ______________________________________. How else is it organized?? Mendeleev arranged the elements by _______________________________ But he noticed there was something still not quite right about it Now, the periodic table is arranged by ______________________________! How do you read the PERIODIC TABLE? What is the ATOMIC NUMBER? oThe number of _______________ found in the __________________ of an atom Also… If it is a _____________ atom (not an ION) the atomic number will also tell you the number of ___________________ What is the SYMBOL? oAn abbreviation of the __________________________. What is the ATOMIC WEIGHT? oThe number of __________________________________ in the nucleus of an atom. How do I find the number of protons, electrons, and neutrons in an element using the periodic table? # of PROTONS = _____________________________________ # of ELECTRONS = _________________________________ (neutral) # of _________________ = ATOMIC WEIGHT - ATOMIC NUMBER Parts of the Periodic Table The periodic table is divided into rows and columns… –GROUPS – ___________________ across periodic table; there are ________ groups –PERIODS – _______________ up and down the periodic table; there are _____ groups Special Group Names Group 1: ______________________________ Group 2: ______________________________ Group 3-12: ____________________________ Group 17: ______________________________ Group 18: ______________________________ ___________________________ on the bottom called Lanthanides and Actinides How else is it organized? Metals are found to the __________ of the _________________ in the periodic table Non-metals are found to the __________________ of the ________________ Right on the staircase are elements having both metallic and non-metallic properties and these are called _________________________ (semi-metals) Properties of… METALS –Conduct ________________________ –____________________ (can be pounded into a thin sheet) –____________________ (can be drawn into wires) –____________________ at room temperature (except __________) NON-METALS –Do not conduct _________________________ –_________________ (if solid) –Non-ductile –Solids, liquids or gasses at _____________________________________ METALLOIDS Have both metallic and non-metallic ___________________ (ex. Semiconductor) Includes: ______________________________________________________
