Download RATN Pg 84-89 Rutherford 1909 Gold foil experiment Shot streams

RATN Pg 84-89
Rutherford
1909 Gold foil experiment
Shot streams of positive particles towards gold foil
Most passed through but some particles were bounced
back
1911 revised atomic theory.
Proposed that the center of the atom is a tiny, dense,
positively charged area called the nucleus
Most of the atom’s mass is in the nucleus
Calculated that diameter of nucleus as 100,000 times
smaller than the diameter of the gold atom.
Bohr
1913, Danish Scientist
Suggested that electrons travel in definite paths around the
nucleus
Proposed no path between levels, but electrons can jump
from one path to another
Modern
model
Schrodinger
& Heizenberg
Electrons do not travel in definite paths
Electron clouds - areas inside the atom where electrons are
likely to be found