Chemistry 11 Atomic Theory I Name: Date: Block: 1. Atomic Theorists and Theories 2. Atomic Structure Atomic Theorists and Theories Scientists create models to… 1. 2. 3. 4. Early Greek Theories • Democritus: 400 BCE o Suggested that all matter was made up of tiny indivisible particles called ______________________________________________ • Aristotle: 350 BCE o Modified an earlier theory and though that matter was made of ________________________________________________________ __________________________________________________________________ o He was ___________________________ but his theory persisted for 2000 years John Dalton • In 1800, John Dalton proposed a theory based on _______________________________________ • His ideas accounted for: o Law of Conservation of ____________________ o Law of Constant _________________________________________ ⇒ Dalton’s Atomic Theory: 1. All matter is made up of _________________________ 2. Atoms of an element are _______________________________ 3. Each element has ______________________________________________________ 4. Atoms of different elements _________________________________________ ____________________________________________________________________________ 5. Atoms are ___________________________________________ in reactions
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o Hecouldnotexplainwhytheelectrons___________________________________________________________________________________________________________________________________________________
A. ParticlesXandYareisotopesofthesameelement.B. ParticleXisanatom,andparticleYisanionofthesameelement.C. ParticleXandYareatomsofdifferentelements.D. ThereisnosignificantdifferencebetweenparticlesXandY.