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Period: Jan 1, 1000 to
atomic structure
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May 6, 1000
democritus
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isaac newton
proposed a mechanical universe with small solid masses in motion -
john dalton
argued about the atomic theory originally proposed by the greeks -
jj thomson
jj thomson proposed that the atom had a plum pudding structure -
the quantum idea
planck quantum idea was developed as a way of explaining black body radiation and the associated ultraviolet catastrophe. -
the geiger marsden experiment
involiving a beam of alpha particles fired at a thin foil of gold to measure the deflection as the alpha particles interacted with the plum pudding gold atoms -
the bohr atom
constructed a model of the atom that had small,light, fast,particle like,negatively charged electrons orbiting a small massive positively charged nucleus. -
spectroscopy and quantum numbers
niels bohr,sommerfield,,stoner and pauli devised the quantum numbers from empirical spectroscopic evidence -
lewis theory
lewis proposed the two electron chemical bond later named the covalent bond by langmuir. -
pauling's five rules crystal structure
the crystal structure of an ionic compound. -
pauling's electronegativity
linus pauling used empirical heat of reaction data to introduce the elemental property of electronegativity which he defined as:the desire of an atom to attract electrons to itself -
hellmann feynman theorem
the hellman feynman theorem states that once the spatial distribution of electrons has been determined by solving the schrodinger equation all the forces in the system can be calculated using classical electrostatics -
van arkel-ketelaar triangle
deals with 3 extreme types of bonding metallic ionic and covalent. -
valence shell electron pair repulsion(VSEPR)
states that electron pairs repel each other. -
frontier molecular orbital theory
was developed in the 1960's by kenichi fukui who recognized that chemical reactivity can be expalined in terms of interacting highest occupied MO'S lowest unoccupied MO'S and single occupied MO'S -
molecular mechanics and molecular dynamics
this method treats a molecular as a collection of particles held together by elastic or simple harmonic forces.
