Who among the following discovered the presence of neutrons in the nucleus of an atom?

Correct option is D

The correct answer is (d) J. Chadwick.
· James Chadwick discovered the neutron in 1932.
· Neutrons are neutral particles found in the nucleus of an atom, along with protons.
· Chadwick's discovery was crucial for understanding the atomic nucleus and led to further developments in nuclear physics, including the creation of nuclear reactors and atomic weapons.
Information Booster:
Neutron Discovery:
· Chadwick's experiment involved bombarding beryllium with alpha particles, which led to the emission of a neutral particle, later identified as the neutron.
Additional Information:
E. Rutherford:
· Incorrect. Rutherford discovered the atomic nucleus and proposed the nuclear model of the atom, but not the neutron.
J.J. Thomson:
· Incorrect. Thomson is credited with discovering the electron, not the neutron.
E. Goldstein:
· Incorrect. Goldstein is known for his work on canal rays, which led to the discovery of protons.