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27 Cards in this Set
- Front
- Back
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performed chemical reactions and carefully measures the masses of reactants and products |
John Dalton |
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All matter is comped of subunits |
Atoms John Dalton |
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Atoms have different identities |
Elements |
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Elements combined together in definite ratios to form? |
Compouns |
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________ are never created or destroyed during chemical reactions |
Atoms |
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__________ observed the deflection of particles in a cathode ray tube |
JJ Thompson |
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_________ concluded that atoms are composed of positive and negative charges |
JJ Thompson |
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negatively charged atoms |
Electrons |
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positive charge were distributed throughout the atom like raisins in raisin bread called? |
Plum pudding |
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_______ used oil drops falling in an electric field of known strength to calculate the charge to mass ratio of electrons and to surmise the charge contained in a single electron |
Robert Millikan |
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fired alpha particles though thin, gold foil |
Ernest Rutherford |
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Concluded that the postive charge and the mass of the atom are concentrated at the center of the atom and that the rest is mostly empty space |
Ernest Rutherford |
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determined that electromagnetic energy is quantized or composed of discrete bundles |
Max Planck |
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E = h v |
Energy & Electromagnetic radiation |
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applied the idea of quantized energy to show that electrons exist around the nucleus a ta fixed radius |
Niels Bohr |
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the difference between the two energy levels of an electron |
Plancks equation |
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shows that all particles with momentum have a corresponding wave nature |
Debrogile |
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orbital of each equation s,p,d,f |
Schrodingers equation |
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cumulative mass of all the particles in the atom |
atomic mass |
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total nuclear charge or number of protons in the nuclues |
atomic number |
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same number of protons but different number of electrons |
isotopes i.e. Carbon-12 Carbon-14 |
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Calc Average Mass Number Pb-204 1.42% Pb-206 24.10% Pb-207 22.10% Pb-208 52.40% |
207.3 |
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no two electrons can occupy the same exact energy level of have the same set of four quantum numbers |
Pauli Exclusion Principle |
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address that describes the general distance from the nucleus, the type of orbital filled and the spin |
quantum numbers |
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identify number of electrons in each type of orbital at each energy level |
Electron configurations |
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represents the shell and electron occupies, indicates the distance to the nucleus and relative energy, shells or energy levels |
n - Principle Quantum Number |
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the subshell and electron occupies, describes the shape of the electrons orbital |
I - Angular Momentum Quantum Number |
