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Atomic Models POGIL Activity.doc.pdf - Karlie Phillips...

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Name:__________________________________________________________Date:__________Period:_____POGIL:Atomic Models and the Development of the AtomBackground:Models are used in science as a way to represent what we cannot see.They help us work with,visualize, and understand scientific concepts.However, models are constantly changing as wedevelop new technology and continue to make advancements.We are going to study the atom inthis unit, and it is important to learn about the process of developing our most current model.Model 1:DaltonDalton came up with the theory that described atoms in five postulates, meaning, a set ofconcepts or theories proposed by scientists.Dalton used experimentation to develop hispostulates through testing gases.He first differentiated atoms via atomic weight.His datawas flawed, however, but he is known as the father of atomic theory due to his immense stridesin this topic.His five postulates are listed below:1.All elements are composed of tiny indivisible particles called atoms thatcannotbe broken down further.*2.Atoms of a given element are all similar in their physical and chemicalproperties.*3.Atoms of different elements differ in their physical and chemical properties.4.Atoms of different elements combine in simple, whole number ratios to formcompounds.5.In chemical reactions, atoms are combined, separated, or rearranged, but nevercreated, destroyed, or changed.*Indicates that the postulate is still held as true today.Dalton’s model summarizes these principles by showing that anatom is made up of solid, indivisible particles.This wasoriginally stated by Greek philosopher Democritus, and hecalled the indivisible particleatomos(which means indivisible).However, Democritus did not have any support for his claim.

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Term
Spring
Professor
Bradley
Tags
Atom, Electron, Ernest Rutherford, Atomic Models, JJ Thomson

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