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29 Cards in this Set

  • Front
  • Back
who was Ernest Rutherford
a former student of Thomson who decided to test thomsons theory.
atoms are called the building blocks of _________.
how did rutherford test thomsons theory
he shot radium into gold foil and all of the atoms bounced different ways which showed that the atoms were not soft blobs.
negatively charges particles found in all atoms
what other techniques did thomson use to help him understand the atom.
the plum pudding model which shows that it is an atom with a lot of electrons going throughout it.
is the study of atoms a new idea
no it has been around for over 2000 years
who presented the idea of electron cloud and what about them
Erwin Srhrodinger who was an austrian physicist anda german physicist named werner Heisenberg.
unifying explanation for a broad range of hypotheses and observations that have been supported by testing.
electron cloud
a regions insede the atom where electrons are likely to be found
who was Democritus
a greek philosopher who proposed that in such a situation you would end up with and uncuttable particle.
What was Rutherford's new atomic model
it was that there was a tiny extremely dence center region called the nuclus that was surrounded by electrons, and that the diamiter of the nuclues was 100,000 times smaller than the diameter of the outside of the atom
atoms make up elements, and elements combine to make________.
What was discovered with the cathode-ray tube
he found negatively charged particles in all atoms called electrons, that reacted to the metal plates in the cathode-ray tube
what does the word atom mean
atomos meaning indivisible.
What did thomson prove wrong
that there were small particles inside the atom which meant that atonms could be divided into even smaller points.
the smallest particle into which and element can be divided and stil be the same substance
what did Bohr propose
that there were no paths located between the levels but electrons could jump from a pth in one level to a path in another level.
what did democritus say about atoms
that they were all small, hard partcles made of a single material formed into different shapes and sizes. also that atoms are always maoving and they form different materials when they join together
who presented the idea of electron cloud and what about them
Erwin Srhrodinger who was an austrian physicist
positively charges region, which is extremely dense and the center of the atom
who was J.J. Thomson
a british scientist who made a discovery that identified an error in Dalton's Theory
a representation of an object or system, or a picture of what a theory explains
who was Niels Bohr
a danish scientist who worked with Rutherford and suggested that electorns travel around the nuclues in difinite paths.
what was Daltons theory
1. all substances are made of atoms,2. atoms are small particles that cannot be created , divided, or destroyed.3. atoms of the same element are exactly alike, 4. atoms of different elements are different,5 atoms join with other atoms to make new substances
what did THomson experiment with
a cathode-ray tube
who was aristotle
a greek philosopherwho disagreed with Democritus's ideas.
what did aristotle believe
that you could keep cutting ab object in half over and over and never end up with and indivisible particle.
were aristotles beliefs correct
no, but since he had such a powerful influence on peoples beliefs he made people ignore the correct information that Democritus had come up with.
who was John Dalton
a british chemist and school teacher who wanted to know why proportions are based on the mass of the elements in the compounds