SCIENCE ( Atomic Theories ) Flashcards
A scientific model is a physical and/or
mathematical and/or conceptual representation of
a system of ideas, events or processes.
Atomic
This is the Greek philosopher
Democritus who began the
search for a description of
matter more than 2400 years
ago.
Democritus
He named the smallest
piece of matter “atomos,”
meaning “not to be cut.”
Atomos
Identified gold and
silver as being
elemental.
Robert Boyle
the English Chemist
______________
performed a number
of experiments that
eventually led to the
acceptance of the
idea of atoms.
John Dalton
the
English scientist
___________
Thomson provided
the first hint that
an atom is made
of even smaller
particles.
Joseph John
J.J. Thomson used a _______________ to
deduce the presence of a negatively
charged particle: the electron
cathode ray tube
the English
physicist ___________was hard
at work on an
experiment that
seemed to have little
to do with unraveling
the mysteries of the
atomic structure.
Ernest
Rutherford
worked with
Rutherford on
the disintegration of radioactive
elements.
Frederick Soddy
are atoms
of the same
element having
different masses,
due to varying
numbers of
neutrons.
Isotopes
the Danish
scientist ___________
proposed an
improvement. In his
model, he placed
each electron in a
specific energy
level.
Niels Bohr
Through his Oil Drop Experiment,
______________ was able to determine
the charge and the mass of an
electron.
Robert Millikan
__________ observed that
beryllium, when exposed to
bombardment by alpha particles,
released an unknown radiation
that in turn ejected protons from
the nuclei of various substances.
Chadwick
________________ and
_______________ found
that electrons move in fuzzy
regions or “clouds”, not
distinct orbits
Erwin Schrodinger AND Werner Heisenberg
who found the Quantum
Mechanical Atomic Model or
Wave Model.
Heisenberg and Schrodinger
who Discovery of Neutron
James Chadwick
who found the Oil Drop Experiment
Robert Millikan
who found Bohr Model
Niels Bohr
who discoverd Isotopes?
Frederick Soddy
who invented the Gold Foil
Experiment
Ernest
Rutherford
who invented the cathode ray tube
J.J. Thomson
