Question

The presence of protons and neutrons at the centre of the atom was
suggested by:

A. Protons by J. Chadwick and neutrons by J.J. Thomson

B. Protons by E. Goldstein and neutrons by J. Chadwick

C. Protons by E. Goldstein and neutrons by J.J. Thomson

D. Protons by J. Chadwick and neutrons by E. Goldstein

Answer 1

The presence of protons was suggested by J. Chadwick and the presence of
neutrons at the centre of the atom was suggested by J.J. Thomson.

Hence, option A is correct.