Atomic Theory Grade 9 Science. Theories and Laws What’s the difference between a theory and a...
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Transcript of Atomic Theory Grade 9 Science. Theories and Laws What’s the difference between a theory and a...
![Page 1: Atomic Theory Grade 9 Science. Theories and Laws What’s the difference between a theory and a law??](https://reader030.fdocuments.in/reader030/viewer/2022032702/56649f455503460f94c6792b/html5/thumbnails/1.jpg)
Atomic TheoryGrade 9 Science
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Theories and Laws
What’s the difference between a theory and a law??
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LawsDescriptions of events or patterns that have been observed over long periods of time
Do not involve an explanation, simply state what happens
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Theories
Explain observations that are supported by experimental evidence
Can change if new evidence becomes available
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Development of the Atomic Theory
Men and women from different countries have contributed to our understanding of the atom
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Early Greeks contributed to the Atomic Theory
Empedocles: http://en.wikipedia.org/wiki/Empedocles
Democritus:http://www.timelineindex.com/content/view/1228
Aristotle: http://cstl-csm.semo.edu/mcgowan/ch181/atomhist.htm
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John Dalton1766 - 1844
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Dalton Atomic Theory
State the 4 points of Daltons Atomic Theory:1
2
3
4
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JJ Thomson1856 - 1940
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Atoms composed of small particles
Atoms contain negatively charged particles called electrons
Raisin bun model
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Ernest Rutherford1871 - 1937
Conducted “Gold Foil Experiment”
Realized large space within atoms
Discovered the nucleus of the atom
Established that the nucleus had 2 types of particles: proton (+) and neutron (0)
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Gold Foil Experiment
Positive particles
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Neils Bohr1885 - 1962
Studied the area around the nucleus
Area around nucleus contained electrons (-)
Ran electric current through gas and observed the gas glowing brightly
Proposed electrons surround nucleus in specific energy levels
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Bohr’s Model Glowing Neon Gas
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Study the structure of the Atom with its three sub-atomic particles