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22 Cards in this Set
- Front
- Back
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Direct evidence
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Evidence you get by seeing or touching an object
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Indirect Evidence
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Surcomstancial evidence. Infer. Evidence you get by not seeing or touching the object
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Democritis
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discovered that atom is smallest piece of matter
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Protons
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Positively charged atoms/ in nucleus
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Neutrons
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Neutral Atoms/ in nucleus
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Electrons
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negatively charged atoms/ orbiting nucleus
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Greek Model
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Democritis discovered that keep breaking down matter to get smallest piece (atoms)
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Rutherford
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Gold foil/ shot alpha particles threw gold foil most went threw.
-atom empty space -positivly charged nucleus - electrons scattered around edge |
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Thompson
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Plum pudding- positively charged particles scattered throughout negatively charged electrons
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Dalton
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atoms of same element are the same- vise versa- compounds from by 2 atoms or more joined = H2O
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Bohr
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Electrons orbit nucleus in definite orbits (energy levels) and energy levels located certain differences from the nucleus
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Atomic Number
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Number of protons or electrons in an atom
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Isotopes
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Atoms of the same element but differ by their mass number
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Mass number
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Number of protons and neutrons in an atom
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Atomic Mass
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the average of the mass number of and elements different isotopes
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Quarks
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Things protons and neutrons are made of
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Strong Force
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it holds the nucleus together
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Weak Force
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in radioactive decay makes the neutrons change into a proton or electron
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Electromagnetic Force
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It attracts the positive and negative particles
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Gravity
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Attracts all objects in nature
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Atomos
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Indivisible start of word atom
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Wave Model/Modern Atomic Model
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Impossible to determine exact location of an electron
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