20 Questions
What did Thomson propose in his atom model?
Thomson proposed that atom can be regarded as a sphere of positive charge with negatively charged electrons uniformly distributed.
What are the key features of Rutherford's atom model?
Rutherford's atom model consists of a positively charged nucleus with electrons revolving around it, held together by electrostatic force of attraction.
What is the main drawback of Rutherford's atom model?
It cannot explain the stability of an atom and fails to explain the spectrum of hydrogen.
What were the observations from Rutherford's gold foil experiment?
Most alpha rays passed through the foil, a few deflected, and very few bounced back.
Define the photoelectric effect.
The ejection of electrons from a metal surface when light falls on it.
What are the key postulates of Bohr's atom model?
Electrons revolve around the nucleus in definite orbits, with no energy loss or gain as long as they remain in an orbit.
What are the merits of Bohr's atom model?
It could explain the stability of an atom and the spectrum of hydrogen.
What criterion determines the permitted orbits in Bohr's model?
Only orbits whose angular momentum is a multiple of h/2π are permitted.
What did Rutherford's gold foil experiment reveal about the atom's structure?
The experiment inferred that most of an atom is empty space with a small, positively charged nucleus.
How does the electron behave in Bohr's atom model?
Electrons revolve around the nucleus in specific orbits without losing or gaining energy.
What did Rutherford's gold foil experiment reveal about the atom's structure?
Most part of an atom is empty, atom consists of a positively charged centre called nucleus, nucleus is very small compared to the size of the atom
Define the photoelectric effect.
The ejection of electrons from the surface of a metal when light falls on it
What is the main drawback of Rutherford's atom model?
It cannot explain the stability of the atom and it fails to explain the spectrum of hydrogen
What are the key postulates of Bohr's atom model?
Electrons are revolving around the nucleus in definite circular paths called orbits, electrons in stable orbits do not lose or gain energy, permitted orbits have angular momentum as a multiple of h/2π
Explain the spectral lines in the spectrum of hydrogen.
The spectral lines are the result of electron transitions between energy levels in the hydrogen atom, producing distinct wavelengths of light.
What does Thomson's atom model propose?
Atom can be regarded as a sphere of positive charge with electrons uniformly distributed within it
What are the merits of Bohr's atom model?
It could explain the stability of an atom and the spectrum of hydrogen
Explain the concept of the ejection of electrons when light falls on a metal.
This phenomenon is known as the photoelectric effect, where photons transfer energy to the electrons in the metal, allowing them to escape.
What are the observations from Rutherford's gold foil experiment?
Most alpha rays passed through the foil, a few particles deflected, very few particles bounced back
Explain the key features of Thomson's atom model.
Atom as a sphere of positive charge with uniform distribution of electrons, no specific mention of a nucleus holding the electrons
Test your knowledge on the Thomson and Rutherford atom models with this quiz. Explore the key concepts of each model and understand their drawbacks. Challenge yourself with questions on atomic structure and historical developments in atomic theory.
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