Which part of John Dalton’s theory was disproved by J.J. Thomson’s cathode-ray tube experiments?(1 point)
Responses
Atoms can join together.
Atoms can join together.
Atoms can form new substances.
Atoms can form new substances.
Atoms are indivisible.
Atoms are indivisible.
Atoms are small.
Atoms are small.
Atoms are indivisible.
The part of John Dalton's theory that was disproved by J.J. Thomson's cathode-ray tube experiments was the idea that "Atoms are indivisible."
The part of John Dalton's theory that was disproved by J.J. Thomson's cathode-ray tube experiments is "Atoms are indivisible."
To understand how Thomson disproved this part of Dalton's theory, we need to look at the cathode-ray tube experiments. Thomson observed that when an electric current was passed through a cathode-ray tube, a beam of particles was produced. These particles were later identified as negatively charged electrons.
Thomson's experiments showed that atoms were not indivisible as Dalton proposed, but instead consisted of smaller subatomic particles. He discovered that atoms contained negatively charged electrons, which meant that atoms were not fundamental and could be divided into smaller components.
This discovery led to the development of the "plum pudding" model of the atom, where electrons were dispersed throughout a positively charged atomic structure, resembling plums in a pudding. Later experiments by Ernest Rutherford would further refine our understanding of the atomic structure.