The neutron particles were isolated by Chadwick and contained a neutral electrical charge. When was this discovered in relation to other scientist's atomic hypotheses?

Question

After Rutherford but before Thomson
Before Thomson but after Bohr
Before Bohr and Rutherford
After Thomson and Rutherford

Answer 1

The neutron was discovered by James Chadwick in 1932. This discovery came after the work of Ernest Rutherford, who proposed the nuclear model of the atom in 1911, and after J.J. Thomson, who discovered the electron in 1897 and proposed the "plum pudding" model of the atom in 1904. Chadwick's discovery therefore occurred after both Thomson and Rutherford.

Thus, the correct answer is: After Thomson and Rutherford.