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Related Flashcards
Cards In This Set
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Is gold/helium/ethanol/sodium chloride an element, an ionic compound, or a molecular compound?
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*Gold: element *Helium: element *Ethanol: molecular compound *Sodium Chloride: ionic compound
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J.J. Thompson (1897)
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Electrons (negatively charged particles).
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Robert Millikan (1909)
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Mass and charge of an electron
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Plum-pudding Model
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E- distributed throughout diffuse, positively charge sphere
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Henri Becquerel (1896)
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Invisible radiation, consisting of charged particles
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Radioactivity
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Spontaneous emission of high energy radiation and particles (Beta, Alpha)
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Beta Particles/Alpha Particles
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*Beta: high energy electrons (B). *Alpha: +2 charge, mass=He nucleus (a).
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Rutherford
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Gold foil experiment (test Thompson's model of the atom).
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James Chadwick
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Bombarded a thin sheet of beryillium with alpha (a) particles; named neutrons (radiations third type of subatomic particle consisted; electrically neutral).
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The Nucleus
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Positively charged center of an atom (contains nearly all of the atom's mass); consists of two particles: protons & neutrons.
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Protons/Neutrons
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*Protons: positively charged subatomic particles (+1). *Neutrons: electrically neutral subatomic particles (0).
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What is the distance in a nucleus measured in?
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Picometers
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Atomic Mass Unit (AMU)
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Unit used to express the relative masses of atoms ad subatomic particles (equal to 1/2 of a carbon atom); 1 AMU = 1 Dalton (Da).
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What was the measurement 'Dalton' from?
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Named for the English chemist John Dalton.
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How many different isotopes does Neon have?
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Three
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