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23 Cards in this Set
- Front
- Back
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Dalton
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Atomic theory of matter
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Democrtitus
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450 BC atoms
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Millikan
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Determined charge of an electron (oil drop experiment)
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Thomson
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Discovered electrons and protons (CRT Experiments)
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Rutherford
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Nucleus (gold foil experiment)
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Chadwick
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Neutrons
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Bohr
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Proposed that an electron is found only in specific circular paths, or orbits, around the nucleus.
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Hund's Rule
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States that electrons occupy orbitals of the same energy in a way that makes the number of electrons with the same spin direction as large as possible.
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Aufbau Principle
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The rule that electrons occupy the orbitals of lowest energy first. The orbitals for any sublevel of a principal energy level are always of equal energy.
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Pauli's Exclusion
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An atomic orbital may describe at most two electrons, each with opposite spin direction.
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Representative Elements
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Groups 1A-7A
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Representative Elements
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Groups 1A-7A
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Transition Elements
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Group B (main body)
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Representative Elements
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Groups 1A-7A
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Transition Elements
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Group B (main body)
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Inner Transition
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Below the main body
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Representative Elements
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Groups 1A-7A
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Transition Elements
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Group B (main body)
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Inner Transition
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Below the main body
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Atomic size
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In general atomic size increases from top to bottom within a group and decreased from left to right across the period.
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Electronegativity
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Decease from top to bottom and increase left to right.
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Electronegativity
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Decease from top to bottom and increase left to right.
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Ionization Energy
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Decrease from top to bottom. Increase from left to right.
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