12 Questions
What is Thomson's plum-pudding model of the atom?
Thomson's plum-pudding model describes an atom as a sphere of uniform positive charge with negatively charged electrons embedded within, similar to raisins in a plum pudding.
How did Thomson's plum-pudding model account for the electrical neutrality of the atom?
Thomson's plum-pudding model accounted for the electrical neutrality of the atom by considering the mass of the atom to be evenly spread over the atom.
What were the limitations of both Dalton's atomic theory and Thomson's plum-pudding model of the atom?
Both Dalton's atomic theory and Thomson's plum-pudding model could not explain many experimental facts, leading to their abandonment.
Why could Thomson's plum-pudding model not explain the results of the alpha-particle scattering experiment carried out by Rutherford?
Thomson's plum-pudding model could not explain the results of the alpha-particle scattering experiment because it did not account for the existence of a dense, positively charged nucleus within the atom.
What is Thomson's plum-pudding model of the atom?
Thomson's plum-pudding model proposed that an atom is a sphere of uniform positive charge with negatively charged electrons embedded in it, similar to raisins in a plum pudding.
How did Thomson's plum-pudding model account for the electrical neutrality of the atom?
Thomson's model accounted for the electrical neutrality of the atom by proposing that the negatively charged electrons were embedded in a sphere of uniform positive charge, resulting in overall electrical neutrality.
What experimental evidence led to the abandonment of Thomson's plum-pudding model of the atom?
The results of the alpha-particle scattering experiment carried out by Rutherford led to the abandonment of Thomson's plum-pudding model.
Why were both Dalton's atomic theory and Thomson's plum-pudding model of the atom abandoned?
Both Dalton's atomic theory and Thomson's plum-pudding model were abandoned because they could not explain many experimental facts, such as the results of the alpha-particle scattering experiment by Rutherford.
What was the key feature of Thomson's plum-pudding model of the atom?
Evenly spread mass of the atom
Who carried out the alpha-particle scattering experiment that led to the discovery of the nucleus in an atom?
Rutherford
What was the radius of the atom according to Thomson's plum-pudding model?
10 cm
Why were both Dalton's atomic theory and Thomson's plum-pudding model of the atom abandoned?
They could not explain many experimental facts
Study Notes
Thomson's Plum-Pudding Model of the Atom
- Thomson's plum-pudding model of the atom proposes that an atom is composed of a sphere of positively charged matter with negatively charged electrons scattered throughout, similar to plums in a plum pudding.
Accounting for Electrical Neutrality
- The plum-pudding model accounts for electrical neutrality by having the number of positive charges equal to the number of negative charges, resulting in a neutral atom.
Limitations of Dalton's Atomic Theory and Thomson's Plum-Pudding Model
- The limitations of Dalton's atomic theory include the failure to explain the structure of atoms and the existence of isotopes.
- The limitations of Thomson's plum-pudding model include the inability to explain the results of alpha-particle scattering experiments and the lack of a clear understanding of atomic structure.
Rutherford's Alpha-Particle Scattering Experiment
- Thomson's plum-pudding model could not explain the results of Rutherford's alpha-particle scattering experiment, which showed that atoms have a small, dense nucleus.
- Rutherford's experiment involved firing alpha particles at a thin metal foil, and the results contradicted the plum-pudding model's assumption of a uniform positive charge.
Abandonment of Thomson's Plum-Pudding Model
- The experimental evidence from Rutherford's alpha-particle scattering experiment led to the abandonment of Thomson's plum-pudding model.
Key Features of Thomson's Plum-Pudding Model
- The key feature of Thomson's plum-pudding model is the uniform distribution of positive charge throughout the atom.
Contribution of Rutherford's Experiment
- Rutherford carried out the alpha-particle scattering experiment that led to the discovery of the nucleus in an atom.
Radius of the Atom According to Thomson's Plum-Pudding Model
- The radius of the atom according to Thomson's plum-pudding model is not precisely defined, as the model assumes a uniform distribution of charge throughout the atom.
Abandonment of Dalton's Atomic Theory and Thomson's Plum-Pudding Model
- Both Dalton's atomic theory and Thomson's plum-pudding model were abandoned due to their inability to explain experimental evidence and the discovery of the nucleus in an atom.
Test your knowledge about Thomson's plum pudding model of the atom, which proposed a structure where positive charge is spread throughout the atom and negative electrons are embedded within it.
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