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13 Cards in this Set
- Front
- Back
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daltons atomic theory
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matter is composed of small indivisble particles (atoms) - do not change in chemical rxn
given element is made up of one kind of the same atom compound is composed of 2 or more elements chemically combined in fixed preportions chem rxn consists of rearragnement of atoms present in molecule |
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a
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atomic mass, number of protons and neutrons
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z
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atomic number, number of protons & tells you which element
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law of multiple proportions
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when two elements form compound, ration are fixed / always the same
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thompson's experiment
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discovery of electrons
cathoid & anoid, direct negative chare in one directon moving e created magnetic field, could be bent towards / away with + or - first evidence matter is made up of more than atoms that dont change |
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rutherfords experiement
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alfa sent towards gold foil
most passed thru, some particles deflected did so bc hit nucleus, nutrons and protons - with positive charge & mass was able to theorize structure of atom, not being solid but as small center wth large surrounding electrons |
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plank's quantization
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observed when heated solid emits light, color light changes with diff temp
tf atom vibrates @ definite frequency depending on substituentpossible energies emetid liminted to n E=nHv |
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photoelectric effect
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injection of e from surface of metal or other material when light shines on it, only when threshold value is reached
frequency must reach threshold wave - partical duality |
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atomic line spectra
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coninuous: spectrum of light with all wavelengths
line: spectrum with certain colors & wavelengths ea light corresponds to light at given wavelegth |
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bohrs postulates
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electrons can only have specific energy values, tf atom itself can only have specific total elenergy
when levels change, energy levels change - ex change energy to other specific energy level |
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de broglie relation
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photon has realistic mass bc of motion and movement
if light has particle aspects, then particles should share aspects of light only applies to force free environment |
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heisenberge
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wanted to locate positon of e-, developed uncertainty priciple
statistical statement about e probable location |
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schodinger
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used heisenberg uncertaity and broglie's wave & mass to help find e=, which shows e inside wells
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