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14 Cards in this Set
- Front
- Back
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Democritus: Greek Philosopher 100 bc
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mater could not be divided forever
smallest piece indivisible or ATOMOS: not to be cut,indivisible |
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Dalton's Model 1800's
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Atomic Theory :
all elements made of atoms atoms same element same atoms different elements different atoms indestructible & indivisible |
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Thomson's model
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atoms were divisible
discovered smaller particles existed electrons atomic model: pudding like material - |
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Rutherford's Model
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nucleus : center of atom
postive charges in nucleus negative charges scattered outside |
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Bohr's Model
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Improved Rutherford's Model
Electons move in orbit around nucleus |
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Wave Model:Present
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based on wave mechanices
electons do not move in a definite pattern like planets location based on how much energy electon has atoms small +nucleus, large # - elect. making atom nuetral |
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Subatomic particle
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particle smaller than a atom
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Proton
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postive charged particle
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neutron
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neutrally charged particle
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electron
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negative charged particle
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Nucleus
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core of the atoms
99% of the mass 100,000 small than the atom |
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atomic mass unit
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amu: special unit use to measure subatomic particle because the mass is so small
Proton 1 amu neutorn 1 amu electron 1/1836 amu |
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Atomic Number: indentifies element
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number of protons in the nucleus
all elements have different #, which distinguishes the element. Uranium has the most 92 |
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Mass Numer of Atom
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Sum of proton and neutrons
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