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19 Cards in this Set
- Front
- Back
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Greek Model (Democritus) |
- 2000 years ago - atoms are small, hard, and indivisible objects |
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Dalton's Model |
- 1803 - atoms are unique to an element but still indivisible |
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Thomson's Model |
- 1897 - the electrons, a subatomic particle exists |
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Rutherford's Model |
- 1911 - an atom is mostly empty space with dense nucleus |
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Bohr Model |
- 1913 - electrons travel in specific energy levels |
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The Modern Theory |
- electrons travel in a general area |
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Name All seven of The Energy Levels |
- K - L - M - N - O - P - Q |
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Valence Electrons |
the electrons in the outer most energy level |
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Isotope |
an atom with a change in the number of Neutrons |
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Their are two types of Isotopes: Name them |
Stable also most Unstable also is Radioactive and very few |
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Four Forces in an Atom that repels an Atom together: name them |
1. Electromagnetic Force 2. Strong Force 3. Weak Force 4. Gravitational Force |
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Electromagnetic Force |
Protons + Electrons = Attract Protons + Protons = Repel Electrons + Electrons = Repel |
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Strong Force |
overcomes the repelling in the Electromagnetic Force |
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Weak Force |
allows the atom to fall apart; usually unstable nucleus = radioactive = gives off radiation |
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Gravitational Force |
very small and doesn't really have a pull on any of importance |
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Protons weight around to what? |
1 amu |
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Newborns weight around to what? |
1 amu |
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Electrons weight around to what? |
0 amu |
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Mass Number |
Protons and Neutrons added up |
