Atomic Theory & The Periodic Table
AtomicTheory&The PeriodicTable
AtomicTheory
TheBeginningofAtomicTheory
? 440BC?Greekphilosopher, Democritusthoughtallmaterials couldbecutinhalfoverandover unAltheyreachedthesizeofone atom
? Atom=Greekfor"notabletobe divided"
? Democritus'Theory:allatoms aresmall,hardparAclesmadeof onematerialformedinto differentshapesandsizes
Dalton'sAtomicTheory
? JohnDalton?BriAshchemistandschool teacher(late1700's?early1800's)
? Wantedtoknowwhyelementsalways combineincertainways
? (HandOalwayscombinein sameproporAonstomake water)
? Hisexperimentsshowithappens becauseelementsaremadeof singleatoms
? 1803?Dalton'sTheory:
? Allsubstancesaremadeofatoms.Atomsare smallparAclesthatcan'tbecreated/destroyed.
? Atomsofthesameelementareexactlyalike,and atomsofdifferentelementsaredifferent
? Atomsjoinwithotheratomstomakenew substances
Dalton'sTheory: BilliardBallAtomicModel
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