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12 Cards in this Set
- Front
- Back
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John dalton |
Atomic theory Elements are made of atoms Compounds are made of atoms of different elements |
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J. J. Thompson |
Plum pudding- there are alternating + and - charges throughout atom Discovered the electron Electron is negative Cathode rays are negatively charged particles-electrons
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Rutherford |
Gold foil experiment Alpha particles are positively charged Atom is mostly empty space With small dense core |
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Niels Bohr |
Planetary model- p&n inside nucleus called nucleons. Similar to solar system(the electrons around nucleus). 4 energy level can hold 32 electrons. |
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In a neutral atom... |
# of p = # of e |
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P.E.L |
Principle energy level |
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Each PEL was numbered from nucleus outwards |
Back (Definition) |
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Each PEL corresponds to a certain amt of energy... |
n=1 has the lowest energy- energy ^ as u move outwards n=3 —energy—>n=1(closest to nucleus)
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Valence |
Outer most electrons Most loosely held |
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Kernel |
Nucleus + inner shells |
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Isotopes |
Atoms of the same elements w/ a) in terms of sub. atm particles, same protons diff. neutrons b)same at. # but diff. Atm mass |
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Atomic mass problems practice |
Back (Definition) |
