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Published on Nov 22, 2015
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1.
ATOMIC THEORY TIMELINE
MADDI HWANG
Photo by
TonZ
2.
DEMOCRITUS
a Greek philosopher
stated that nothing exists except for atoms and empty space.
"Nothing exists except for atoms and empty space; everything else is opinion."
-Democritus
Photo by
micronova
3.
DALTON'S ATOMIC THEORY
each element is composed of indestructable, small particles called atoms.
all atoms of an element are identical
-they have the same mass, volume, and other physical/ chemical properties
atoms combine in whole number ratios to form compounds
atoms are untreatable, so they have to combine as whole atoms
4.
J.J. THOMSON
made the plum pudding model
the atom is unbreakable
the atoms structure has electrons suspended in a positively charged electric field
5.
RUTHERFORD
developed the theory of an atom's structure
conductuped an experiment with gold foil
he observed the alpha particles
during this experiment found that there is a small, dense center in the middle of an atom
this is the nucleus, which is positively charged
6.
BOHR ATOMIC MODEL
electrons travel in orbits around the nucleus
the farther the electron is from the nucleus, the more energy it has
his model only works with atoms with one electron, hydrogen
7.
ERWIN SCHRÖDINGER
the quantum mechanical model of the atom
found the equation that predicts the probability of finding an electron
with a certain amount of energy in a certain area in an atom
maddi hwang
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