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Atomic and Molecular Structure: Introduction to Atom
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Atomic and Molecular Structure: Introduction to Atom

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Questions and Answers

Who first proposed the concept of the atom?

  • Democritus (correct)
  • Rutherford
  • Bohr
  • J.J Thompson

    • What is the meaning of the term 'atom'?

  • Small invisible particles (correct)
  • Continuous matter
  • Greek philosopher
  • Non-living organisms

    • According to John Dalton, what is true about all elements?

  • Composed of atoms (correct)
  • Only exist in living organisms
  • Have different types of atoms
  • Composed of molecules

    • Which scientist proposed that atoms are constantly moving and cannot be destroyed?

    <p>Democritus</p> Signup and view all the answers

    What happens to atoms in a chemical reaction according to John Dalton's theory?

    <p>Atoms are neither created nor destroyed</p> Signup and view all the answers

    Who among the scientists mentioned contributed to the development of concepts on atoms?

    <p>J.J Thompson &amp; Goldstein</p> Signup and view all the answers

    What did Ernest Rutherford discover in 1909 through his alpha scattering experiment?

    <p>The Nucleus of an atom</p> Signup and view all the answers

    What did Ernest Rutherford name the positive charged particles he found concentrated in the nucleus?

    <p>Protons</p> Signup and view all the answers

    In terms of charge quantity, how do protons compare to electrons?

    <p>Carry the same quantity of charge</p> Signup and view all the answers

    What was one major problem left unsolved by Rutherford's model of atomic structure?

    <p>The composition of the atomic nucleus</p> Signup and view all the answers

    Who provided proof for the existence of neutrons in the atomic nucleus?

    <p>James Chadwick</p> Signup and view all the answers

    How does the mass ratio between helium and hydrogen atoms compare to what was originally expected?

    <p>Larger for helium: 4:1 instead of 2:1</p> Signup and view all the answers

    What happens when electrons jump from higher to lower orbits?

    <p>They release energy as light</p> Signup and view all the answers

    What does the Bohr Model fail to explain regarding spectral lines?

    <p>Relative intensities of spectral lines</p> Signup and view all the answers

    Why is Bohr's model limited to only working for hydrogen atom?

    <p>Mathematical formula mismatch for atoms with multiple electrons</p> Signup and view all the answers

    What concept regarding electron orbits in atoms was postulated by Bohr's model?

    <p>Quantization of electron orbits</p> Signup and view all the answers

    Which physicist developed the idea that electromagnetic radiation has discreet energies?

    <p>Max Plank</p> Signup and view all the answers

    What does the Planck constant relate to according to the text?

    <p>Mass and frequency</p> Signup and view all the answers

    Which subatomic particle has no charge?

    <p>Neutron</p> Signup and view all the answers

    Which subatomic particle is located outside the nucleus?

    <p>Electron</p> Signup and view all the answers

    What is the relative mass of a proton?

    <p>1</p> Signup and view all the answers

    Which subatomic particle is responsible for stabilizing the nucleic charge?

    <p>Electron</p> Signup and view all the answers

    What is the atomic number of an element?

    <p>The total number of protons in the nucleus</p> Signup and view all the answers

    Which subatomic particle has the smallest actual mass?

    <p>Electron</p> Signup and view all the answers

    Who discovered the electron and how?

    <p>J.J. Thomson discovered it using a cathode ray tube</p> Signup and view all the answers

    What charge-to-mass ratio did J.J. Thomson calculate for an individual electron?

    <p>$1.76 \times 10^8$ C/g</p> Signup and view all the answers

    Which scientist determined the charge of the electron with great precision?

    <p>Robert A. Millikan</p> Signup and view all the answers

    What is the mass of an electron according to the data provided?

    <p>$9.10 \times 10^{-28}$ g</p> Signup and view all the answers

    What model of the atom did J.J. Thomson propose based on his experiments?

    <p>Thomson's plum pudding model</p> Signup and view all the answers

    What was the purpose of applying electric and magnetic fields to a beam of electrons in the cathode ray tube experiment?

    <p>To determine the charge-to-mass ratio of an electron</p> Signup and view all the answers

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