객관식
Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?
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2. Atoms & Elements
Atomic Theory
객관식
Which of the following best describes how our modern understanding of atomic structure differs from Thomson's plum pudding model?
A
The modern model suggests that atoms are indivisible particles, while Thomson's model allowed for the existence of subatomic particles.
B
The modern model states that atoms do not contain any charged particles, whereas Thomson's model included both positive and negative charges.
C
The modern model proposes that atoms are made only of electrons, while Thomson's model included both electrons and protons.
D
The modern model describes the atom as having a dense, positively charged nucleus with electrons orbiting around it, whereas Thomson's model depicted electrons embedded in a uniform positive sphere.
검증된 단계별 안내1
Recall Thomson's plum pudding model: it proposed that the atom is a uniform, positively charged sphere with negatively charged electrons embedded within it, like 'plums' in a 'pudding'.
Understand the modern atomic model: it describes the atom as having a small, dense, positively charged nucleus at the center, with electrons orbiting around this nucleus in defined regions.
Compare the two models by focusing on the distribution of positive charge: Thomson's model spreads positive charge uniformly throughout the atom, while the modern model concentrates it in the nucleus.
Note the arrangement of electrons: in Thomson's model, electrons are fixed within the positive sphere, whereas in the modern model, electrons move around the nucleus in orbitals or energy levels.
Summarize the key difference: the modern atomic model introduces the concept of a nucleus and electron orbits, replacing the idea of a uniform positive sphere with embedded electrons.
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