Multiple Choice
In atomic theory, the electron cloud (quantum mechanical) model describes electrons as existing in probability distributions rather than fixed orbits. Who is most closely associated with developing this model?
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4. Atoms and Elements
Atomic Theory
Multiple Choice
In the development of atomic theory, who hypothesized that atoms are tiny, hard, indivisible spheres?
A
Niels Bohr
B
J. J. Thomson
C
Ernest Rutherford
D
John Dalton
Verified step by step guidance1
Understand that the question is about the historical development of atomic theory and the scientists who contributed to it.
Recall that John Dalton proposed the idea that atoms are tiny, hard, indivisible spheres, which was a foundational concept in early atomic theory.
Recognize that Niels Bohr developed a model of the atom with electrons orbiting the nucleus in specific energy levels, not indivisible spheres.
Know that J. J. Thomson discovered the electron and proposed the 'plum pudding' model, where atoms were divisible and contained smaller particles.
Remember that Ernest Rutherford discovered the nucleus and proposed a nuclear model of the atom, which also contradicted the idea of indivisible spheres.
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