Exam – Chemistry – Flashcards
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| Pauli exclusion principle |
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| two electrons per orbital |
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| Aufbau |
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| electrons occupy the lowest level or energy |
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| Hund’s Rule |
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| - electrons occupy equal energy orbital’s so that a minimum number of unpaired electrons |
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| Newlands |
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| based his table on music |
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| Mendeleev |
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| arranged the table by atomic mass |
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| Bohr |
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| proposed the existence of energy levels |
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| Rutherford |
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| couldn’t explain the chemical properties of elements |
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| Dobenreiner |
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| arranged elements into triads |
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| Ground |
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| 1s^2 2s^2 2p^6 3s^2 |
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| Excited- |
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| 1s^2 2s^2 3s^1 3p^1 |
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| Impossible |
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| 1s^2 2s^3 2p^6 3s^1 |
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| In the forth quantum there are four sublevels called |
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| S,P,D,F |
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| The lowest sublevel that can be found within an electron is called |
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| the s sublevel |
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| The maximum number of electrons that can go into the f sublevel is |
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| 14 |
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| The quantum number |
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| = the number of sublevels |
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| Quantum mechanical model |
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| determines the allowed energies an electron can have and how likely it is to find the electron in various locations around the nucleus |
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| Atomic orbital |
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| often thought of as a region of space in which there is a high probability of finding an electron |
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| Quantum |
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| the amount of energy required needed to move an electron from one energy level to another |
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| Energy levels |
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| fixed energies that an electron can have |
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Atomic mass
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| weighted average mass of the atomic atoms in a naturally occurring sample or element |
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| Isotopes |
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| atoms that have the same number of protons but different number of neutrons also have different saggy assed mass numbers |
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| # of neutrons |
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| mass # – atomic # |
