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Who said that matter was discrete, not continous, couldn't get a smaller piece
Democritus
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Who called atoms, atomos?
Leucippus
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Who came up with the theory of the behavior of matter
Dalton in the 1700s
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who discovered the electron
Thompson
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why is plum pudding like atoms
the raisins in the pudding are like a spherical blob with positive and negative charges inside
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who discovered radioactivity
becquerel
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what element was used to discover radioactivity
uranium
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what is the symbol for alpha
Αα
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what is the symbol for beta
Ββ
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what is the symbol for gama
Γγ
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who performed the gold foil experiment
rutherford
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what did the gold foil experiment confirm
that the positive atom and mass was in one spot and the rest was empty space, so it passed through easily
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what is an atom mainly made out of
empty space
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what part of the atom was deflected
the nucleus or nucleolus
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what is on the inside of the atom
the protons and neutrons
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what orbits around the nucleus
electrons
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what is the atomic number
how many protons are in an atom
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what is the mass number of an atom
the total number of protons and neutrons
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what is an isotope
the same element with a different number of neutrons
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what is the half-life of an atom
the time it takes for a radio active element to decay half of the way into a new element
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does light act like a wave or particle
either or, but never both at the same time
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who developed the way of an atom's structure
bohr
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how many electrons are in the first shell
2
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how many are in the 2nd, 3rd, 4th, and so on shells in an atom
8
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what happens when electrons absorb more energy
they get brighter
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what happens as electrons lose energy
they're light dims and eventually goes out when it goes back to a lower level
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what does a black line mean
absorbtion
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what does colored lines mean
emission
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why does an object still glow at night when it's dark
the electons reach a metastable state where they glow for an unusually long time
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why does something float
it's less dense than the liquid it's floating in
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why does an object sink
it's more dense than the liquid it's floating in
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