Which of the following statements is correct?
Correct answer: D. Chadwick experiment shows the presence of neutrons
- A. Faraday's experiment proved the existence of electrons
- B. Crookes tube experiment shows the presence of electrons and protons in the atoms
- C. Radioactivity confirms the presence of electrons and protons
- D. Chadwick experiment shows the presence of neutrons
Explanation
Option D is correct. Chadwick bombarded a sample of beryllium with alpha particles and observed a new form of radiation that was not affected by electric fields. He concluded that this radiation consisted of neutral particles, which he named neutrons. Neutrons have no electric charge but have a mass similar to protons.
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Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
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