chemistry atomic structure, electron configuration
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| Electrons (e-) | *negatively charge *discovered by J.J Thomson *mass of 1/1840 atomic mass unit (amu)
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| Protrons (p+) | *positively charged particles *discovered by Goldstein *mass of 1 atomic mass unit (amu)
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| Neutrons (n0) | *have no charge *discovered by James Chadwick *mass of 1 atomic mass unit (amu)
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| Isotopes | Are atoms of the same element. They have the same # of protons but different #'s of neutrons
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| John Dalton | considered the atom ad a solid indivisible mass
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| J.J Thompson | proposed the plum-pudding model
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| Ernest Rutherford | proposed the nuclear atom
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| Niels Bohr | proposed the planetary model
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| Erwin Schrodinger | proposed the quantum mechanical model
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| Aufbau Principle | electrons enter orbits of lowest energy first
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| Pauli Exchsion Principle | *an orbital can hold 2 electrons *the electrons must have opposite spins
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| Hund's Rule | when electrons occupy orbitals of equal energy one electron occupies each orbital until all the orbitals contain one electron
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| How do u get the D block in electron configuration? | the D block is always one less then S,P *ex-26---1s2 2s2 2p6 3p2 3p6 4s2 3d6
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| How do u get the F block in electron configuration? | *u go through La on 58,71 *just add La to 59-70 *ex- 58---6s2 5d1 4f1 *ex- 59---6s2 4f3
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| What r the 2 exceptions in electron configuration? | chromium and copper
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