Question

Which of the following was/were not discovered at the time of Rutherford’s experiment?
(i) Electrons
(ii) Protons
(iii) Neutrons

• A. Only (i)
• B. Both (ii) and (iii)
• C. Only (iii)
• D. Only (ii)

Answer 1

The correct option is C Only (iii)

Rutherford put forward his nuclear model of atom in 1911. Only electrons and protons were known to be present in the atom as neutrons were discovered much later in 1932. Thus, the original model of an atom given by Rutherford, consisted of only protons in the nucleus and no neutrons.
Hence, the correct answer is option (c).