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21 Cards in this Set
- Front
- Back
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Democritus
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a greek philosopher who came to the assumption that the smallest part of matter was the atom and that it was indivisible
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Protons
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Subatomic particles that have a positive charge and is found in the nucleus of an atom
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Neutrons
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Subatomic particles with no electric charge and is found in the nucleus of an atom
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Electrons
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Negatively charged subatomic particles found in the area outside the nucleus
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Rutherford
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He was an English physicist who discovered that most of the atom is empty space
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Thomson
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He was an English scientist who made the plum pudding model and discovered the electron
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Dalton
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He was an english chemist who created the atomic theory
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Bohr
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He was a Danish scientist who figured out that electrons orbit the nucleus
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Modern Atomic Model
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It is the model that we currently use today. It shows what we believe at the moment
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Atomic Number
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It is the total number of protons in the nucleus of an atom
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Isotope
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An atom of an element that has the same number of protons as another atom of the same element but a different number of neutrons
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Mass Number
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Sum of protons and neutrons in the nucleus of an atom
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Atomic Mass
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Average of the masses of the existing isotopes of an element
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Quarks
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Particles that make up all other known particles in the nucleus of an atom
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Strong Force
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Force that binds protons and neutrons in the nucleus
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Weak force
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Force that is the key to the power of the sun
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Electromagnetic Force
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Force of attraction or repulsion between particles of an atom
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Gravity
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Force of attraction between all objects in the universe. Also the weakest force
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Greek Model of the Atom
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The Atom is indivisible and indestructible. It is the smallest piece of matter
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Indirect Evidence
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Evidence providing only a basis for inference
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Direct Evidence
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Evidence that stands on its own to prove an alleged fact
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