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21 Cards in this Set
- Front
- Back
Ionization |
Horizontally, increases Verticay, decreases |
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Electronegativity |
Horizontally, increases Down, decreases |
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Atomic Radii |
Horizontal,decreases Vertical, increases |
|
Group |
Vertical on periodic table |
|
Period |
Horizontal |
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Democritus |
Greek philosopher who was among the first to suggest the existence of atoms |
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John Dalton |
English chemist and schoolteacher who formulated a theory to describe the structure and chemical reactivity of matter in terms of atoms |
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Charge and weight of protons? |
Charge + Weight 1 amu |
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Charge and weight of neutrons? |
Charge none Weight 1 amu |
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Charge and weight of electrons? |
Charge - Weight 1 amu |
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Mass number |
neutrons+protons |
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Atomic number |
Number of protons in nucleus |
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Isotope |
Atoms that have the same number of protons but different numbers of neutrons |
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Ion |
An atom woth a net charge due to the loss or gain of an electron |
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JJ Thompson |
Found that atoms sometimes eject a far smaller negative particle which is called and electron |
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Rutherford |
Detailed model with a central nucleus, positive charge in nucleus |
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Bohr |
Electrons were in orbits, each orbit can only contain a set number of electrons |
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Moseley |
Rearranged the elements in order of increasing atomic number |
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Dobereiner |
Classified elements into groups of three, called triads |
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Seaborg |
The actinide series |
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Mendeleev |
Organize elements in order of increasing atomic mass |