Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. What experimental evidence led to the development of this atomic model from the one before it? A few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil. Experiments with water vapor showed that elements combine in specific proportions. Equations were used to identify regions around the nucleus where electrons would likely be. Cathode rays were bent in the same way whenever a magnet was brought near them.
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- The question refers to an atomic model that was developed based on specific experimental evidence. The key piece of evidence mentioned is that "a few of the positive particles aimed at a gold foil seemed to bounce back off of the thin metallic foil." Show more…
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In 1911, Ernest Rutherford conducted an experiment where he shot positively charged alpha particles at a thin sheet of gold foil. Most of the particles passed through the gold foil, but some bounced off at different angles. From these observations, Rutherford concluded that a. most of the atom is empty space b. there is a small, dense, positively-charged center in the atom c. the nucleus contains the protons and neutrons d. all the above 2. Which part of Dalton's Atomic Theory needed to be revised because it is no longer believed to be true? a. All matter is made up of atoms. b. Atoms are indivisible. c. Atoms of different elements are different. d. Atoms unite to form compounds.
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The classical model of the atom, with an electron orbiting around the nucleus like a planet around the Sun, was invalidated by the experimental evidence that: the electron is a composite particle, made up of two quarks alpha particles directed at gold foil sometimes bounce back the way they came the nucleus contains not only protons, but also bound proton-electron pairs all accelerating charged particles emit EMR and would therefore lose energy
Ivan K.
The original experiments which established that an atom has a heavy, positive nucleus were done by shooting alpha particles through gold foil. The alpha particles used had a kinetic energy of 7.7 $\mathrm{MeV} .$ What is the closest they could get to a gold nucleus? How does this compare with the size of the nucleus?
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