Which of the following options represents sub-atomic particles found in Thomson's model of an atom ?
Only electrons
The correct answer is Option 3 i.e. only electrons.
Apologies for any confusion caused by earlier responses. Upon reviewing the information, I can confirm that J.J. Thomson's atomic model, proposed in 1904, included only electrons as subatomic particles. At that time, the existence of protons and neutrons had not yet been discovered.
Key Points:
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Electrons: Discovered by Thomson in 1897 through experiments with cathode rays, electrons are negatively charged particles.
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Protons and Neutrons: These particles were identified later; protons in 1917 by Ernest Rutherford and neutrons in 1932 by James Chadwick.
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