Multiple Choice
Which of the following is a reason why Dalton's atomic theory was later found to be incorrect?
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2. Atoms & Elements
Atomic Theory
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Which atomic model was proposed as a result of J. J. Thomson's work?
A
Quantum mechanical model
B
Planetary model
C
Solid sphere model
D
Plum pudding model
Verified step by step guidance1
Understand the historical context of atomic models before and after J. J. Thomson's work.
Recall that J. J. Thomson discovered the electron through his cathode ray experiments, which showed that atoms contain smaller charged particles.
Recognize that to incorporate the existence of electrons, Thomson proposed a new atomic model where electrons were embedded within a positively charged 'soup' or 'cloud'.
Identify this model as the 'Plum pudding model', where negatively charged electrons are scattered like 'plums' inside a positively charged 'pudding'.
Note that this model was later replaced by the planetary model and quantum mechanical model as more experimental evidence became available.
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